Saturday, February 09, 2013

B71 #103 Dinner on Jan 30, 2013

Dear All,

Belated, please find attached the group photo taken at the Jan 30 reunion dinner.

Again, thanks to Man-wan for organizing the gathering and Lilian for booking the venue at the CityU Restaurant, where the dishes were simply scrumptious whilst the price was a steal!

Taking this opportunity, would like to extend our best wishes for the Chinese New Year from the Yau's family.



Gong Xi Fa Cai !!!

David aka Man-tak @Hong Kong

Feb 9, 2013

Wednesday, October 19, 2011

B71 #102: Lunch on Nov 16, 2011

from Chiu Ying Lam
to Man Wan So

date 29 September 2011

subject BSc 1971 lunch, Wed 16 November

Dear BSc 1971 classmates,

In 1971 we graduated from HKU. By this time of the year in that year, some of us started working, some continuted studying in HK or overseas, some emigrated and got married, some changed course and started anew in another academic field, and some pursued their dreams in their own ways.

It has been forty years since. Maybe it is time to reflect as we move into another phase of our life.

Those are grand words. Let us commemorate the 40th anniversary of graduation in a more down to earth manner.

I propose a long lunch on Wednesday 16 November. Ho Sui Ki has kindly offered to organize the lunch at the Graigengower Cricket Club 紀利華木球會(at the junction of Leighton Road 禮頓道 and Wong Nei Chong Road 黃泥涌道).

Those who have retired are invited to come early at 12 noon. Those who are still working may come later and leave earlier. I imagine that we could hold onto the table(s) beyond 2 p.m.

I understand that Grace & William Ho (from Scotland) and Grace Leung (from Australia) will be back in Hong Kong then. The lunch promises to be an interesting time.

Spouses and children are welcome.

As usual the cost of the meal will be shared out among the attendees.

Those who intend to join the lunch please notify Man Wan at . You may simply press "reply to all".

Chiu Ying



* Lam Chiu Ying & So Man Wan
* Grace & Billy Tao
* Grace & William Ho
* Peter Chung
* Edward Sin
* Daniel Ho
* Lam Hung Biu
* Choi Ho Pang (x2)
* Wu Dick Kin
* Philip Chow
* Leung Sze Chung
* Clara Fung
* David Yam
* Lo Mun Ling
* Cheung Foon Hung (x2)
* Leung Wing Kwong
* Yau Man Tak

Total 22

Monday, August 08, 2011

B71 #100: Dinner on August 19, 2011

Dear classmates,

With the kind help of Lilian, we shall be organizing a summer dinner at Shing Hin, 9/F, Amenities Building, City University on Friday 19 August.

As usual, we'll share out the cost of the dinner. Spouses and children are welcome.

Leung Sze Chung has kindly agreed to give a talk on his forensic work before the dinner. Those who came to the last dinner would remember the marvellous talk on Peter Ma on jade, which opened our eyes to the exciting world of gems. Sze Chung's talk promises to be another eye-opener. You will get a glimpse into how science is made to work to detect fake wills, for example, so as to bring justice to bear on the fraudulent.

The proposed programme is:

- 6:15 p.m. arrival and chat
- 6:45 p.m. talk + Q&A
- 7:30 p.m. dinner

Those who are interested in joining the dinner please kindly reply to Man Wan and me using the "reply to all" button.

Chiu Ying

Original posted by Lam Chiu Ying

Monday, February 21, 2011

B71 #98: Celebrating 40th anniversary since graduation

* Lam Chiu Ying
* Edward Sin
* Philip Chow
* Anthony Wu
* Raymond Choi

* David Yam
* Wong Hin Hing
* Lilian Vrijmoed
* Gilbert Wong
* David Yau
* Kevin Ko
* Cheung Foon Hung
* So Man Wan


from Chiu Ying Lam
date 30 March 2011 22:47
subject HKU 1971 - 40th anniversary dinner

Dear BSc 1971 classmates,

The University alumni office has confirmed that the dinner will take place at Loke Yew Hall on 28 June. The cost is $1,800 per person.

It is somewhat expensive, but it is a once-in-10-year event. Also the occasion will be leveraged to secure donations from outsiders to support the installation of 40 pieces of artwork in the new centenary campus. This will add an artistic touch to HKU, helping prevent it from becoming a place with only a focus on money and money and money.

I have booked and paid for two tables to accomodate science alumni.

Could those attending please kindly confirm your attendance with me? You may pay me on the day or send a cheque to me at "5H, Tower 6, Laguna Verde, Hunghom, Kowloon".

The organizer is asking me to offer a short 3-5 minute entertainment programme. Several faculties will do singing by a small group. A band organised by Chan Nam Luk will provide accompaniment.

I vaguely remember that Chow Yiu Wah was a singer. Could you help with the singing, or organising the singing effort?

Chiu Ying

---------- Forwarded message ----------
From: Chiu Ying Lam
Date: 21 February 2011 18:10
Subject: 40th anniversary - HKU 1971 & BSc 197

Dear BSc 1971 classmates,

2011 is the 40th anniversary of our graduation.

HKU will organize a dinner to celebrate this event. The date is 28 June. Details are yet to be worked out. Please mark your calendar.

It is an all-faculty dinner at Loke Yew Hall, mostly a fun event. There will be no raffle tickets nor auctions nor any other fund-raising thing at the dinner per se. A couple of enthusiastic alumni will however use the dinner as an excuse to bring donations to HKU.

Regarding the celebration by the BSc class itself, the responses to my previous mail on the subject generally point towards November, and the preference for the excursion out of Hong Kong is Taiwan. I shall work on the ideas further.

Chiu Ying

B71 #97: Dinner on Feb 18, 2011












Written by Peter Chung on 2011-02-20

Thursday, June 03, 2010

B71 #96: Joint lunch across disciplines

Date: June 10, 2010
Time: 12:45 pm
Place: Chariot Club at 2/F Melborne Plaza, Central

We have more and more interaction with B71 graduates across disciplines:
a) Evelyn Man, Annie Liang and May Tam will be helping as Grace Tutors (set up by Science alumni) to tutor students on English subjects.
b) Metzi Leung introduced friends from the Boys & Girls Club Association that enables the Grace Tutors to start helping students with Learning Disabilites.

Besides, Raymond Choi has collected several copies of the 70th anniversary commemorative booklet for delivery if you would like to get one.

Glad if you will join us.

Edward Sin

Sunday, March 28, 2010

B71 #95: Joint Lunch on April 8, 2010

Date: April 8, 2010
Time: 12:45 pm
Place: Chariot Club at 2/F Melborne Plaza, Central

As Shelley Lee (BA 1971) will be helping to organize English Tutoring course, it is likely that the Grace Tutors project likely to be promoted as HKU Centennial celebration project in the name of HKU Class of 71.

The HKU Centennial celebration committee has invited us to prepare a presentation of our idea on April 15 at 6:00 pm to 8:00 pm. We shall discuss more details at the Joint Lunch (across disciplines) on April 8, 2010.

Would appreciate more classmates to attend the Joint Lunch on April 8, 2010 at 12:45 pm to 2:00 pm.

I invited Lam Chiu Ying to attend. He said he would be out of town.

I asked him if he would help to organize Putonghua course. He said he could send a team of Putonghua tutors if needed. You are very helpful. Thank you, Chiu Ying. .

Grateful for your participation.

Edward Sin

Monday, March 01, 2010

B71 #94: Lunch on March 11, 2010 (Horizontal integration)

This is our second joint lunch --- Please refer to Post #85 for our first lunch on March 13, 2009.

Date: March 11, 2010
Time: 12:30 pm
Place: Chariot Club at 2/F Melborne Plaza, Central

* Shelley Lee (BA)
* Annie Liang Bentley (BA)
* Sharon Evans (BA)
* Patricia Yeung (BA)
* Mergy Chan (BA)
* May Tam (BA)
* Mitzi Leung (BA)
* Tong Tak Cheung, Ronald (MBBS)
* Edward Sin (BSc)
* David Yam (BSc)
* Philip Chow (BSc)

//////////// Future gatherings //////////////////

From Sharon Evans (BA 71)
date 11 March 2010

All future lunches will be 2nd Thurs of the month. Perhaps you can mark these down for the year and notify us nearer the date as to how many of you can join us. Sharon

Friday, January 15, 2010

B71 #92: Lunch with Prof Enoch Young

from LiLian Vrijmoed
to Edward Sin
date Thu, Jan 21, 2010 at 8:08 PM
subject RE: Booking of Shing Hin

Dear Edward,

A room on the 9/F at the City Top has been booked under港大校友会 with a table of 12. You can ask for Mr 姜 in relation to parking. Pay a flat rate of HK$20. I have also told him you guys will be having dim sum, fried rice/noodles etc.

Directions CityU is attached.

Let me know if I can be of further help.


---------- Forwarded message ----------
From: Edward Sin
Date: Fri, Jan 15, 2010 at 9:41 AM
Subject: Lunch on Jan 31 with Prof Enoch Young

Prof Enoch Young taught us Nuclear Physics while at HKU. He spent a few years at CERN watching accelerated particles collision.

As his name implies, Prof Young is as energetic as Raymond Choi, as humorous as David Yau.

Do come and enjoy the lunch.

Lunch Date: Jan 31, 2010 (Sunday)
Time: 12:45 to 2:30 pm
Venue: Shing Hin Restaurant at City University
Shing Hin Restaurant, 城軒
9/F Amenities Building,
City University,
Yau Yat Chuen

So far participants attending the lunch gathering are:
* Prof Enoch Young
* Edward Sin
* Raymond Choi
* Leung Wing Kwong
* Lily Yeung x 3
* Grace Ho
* William Ho
* David Yau
* Kevin Ko
* Robert Lam x 2
* Clara Fung

Total 14

Edward Sin

Thursday, August 06, 2009

B71 #91: Dinner on September 25, 2009

Date: 2009/8/6

Dear all,

I would like to invite my dear old classmates to a dinner in our Chinese Cuisine Training Restaurant on 25 September

It is my pleasure, and as 曼德大佬 said, this gives my students valuable opportunities of training for which I would be very grateful.

Could we ask interested classmates to indicate availability on 25 September please, so that I can arrange for the booking and menu.


The Chinese Cuisine Training Restaurant

Pokfulam Training Centre Complex,
145 Pokfulam Road, Pokfulam, Hong Kong
香港薄扶林道145 號薄扶林訓練中心綜合大樓

Located on the 8th floor of the Pokfulam Training Centre Complex, the Chinese Cuisine Training Institute is VTC's flagship restaurant, specializing in the fine art of Chinese cuisine.

The restaurant has superb views over looking the western shores of Hong Kong Island and the western Hong Kong channel.

Enjoy a relaxing meal in beautiful and spacious surroundings.


* Carrie Willis
* Clara Fung
* David Yam
* David Yau x 2
* Kevin Ko
* Kevin Ho
* Edward Sin
* Philip Chow
* Lilian Kwan
* Lam Chiu Ying & So Man Wan
* Ma Siu Lam & Mary Lo
* Chu Fu Yau
* Robert Lam x 2
* Leung Wing Kwong
* Wong Hin Hing
* Anthony Wu
* Gilbert Wong

(total 21)

Monday, July 27, 2009

B71 #90: Dinner on August 25, 2009

Back Row:
David YAM, Clara CHAN, LEUNG Wing Kwong, Christopher SO, CHUNG Yip Wah, Anthony WU, MA Siu Lam

Front Row:
Mary LO, Philip CHOW, SO Man Wan, LAM Chiu Ying, YAU Man Tak, Raymond CHOI, Kevin HO, Kevin KO, CHU Fu Yau & Priscilla CHU


from C Y Lam
cc Kevin KO
date Wed, Jul 22, 2009 at 11:54 PM
subject "End of summer vacation" dinner for BSc 1971

Dear classmates,

A number of classmates have suggested to organize a dinner towards the
end of the summer vacation. One of the rationale is to celebrate the
award of Bauhinia Stars to some of our classmates. But I really see it
as a pretext to call a gathering of old friends.

The date: 25 August (starting at 7:00 p.m., to be confirmed later)
The venue: Staff restaurant of 城軒 of City University (courtesy of Lilian)

Because I shall be travelling outside Hong Kong for three weeks in
August, Kevin Ko has kindly agreed to help organize the function.

Anyone interested in joining the dinner please notify Kevin Ko at the email address:

The cost of the dinner will be shared by all, including the Bauhinia
Star awardees.

Chiu Ying

* Chung Yip Wah
* Clara Fung
* Lam Chiu Ying & So Man Wan
* Mary Lo & Peter Ma Siu Lam
* Kevin Ko
* Raymond Choi
* Christopher So
* David Yam
* Chu Fu Yau x 2
* Philip Chow
* Gilbert Wong
* Leung Wing Kwong
* David Yau

Monday, July 06, 2009

B71 #89: 金/銀/銅 紫荊星章

fromBilly Tao
dateTue, Aug 25, 2009 at 6:33 AM
subject BSc: Seven Bauhinia Awardees

Dear classmates,

Here's my congratulation verse to the seven Bauhinia awardees:


Some explanation of terms:

邱: 通丘(漢書); by 鄉邱 I was referring to the peak area in HK, the site of our alma mater.

鍾: goblet. I wouldn't recommend such 開懷痛飲 though, especially if you are driving :-)

吳蓴(或蒓)泛指家鄉美食, 取自張翰蓴羹鱸膾典, please see:

Once again, my heartiest congratulations and may I wish all of you a most memorable dinner tonight (August 25, 2009).



Bauhinia Awardees:
* Chung Yip Wah (BBS 2004)
* Clara Chan (BBS 2005)
* Anthony Wu (BBS 2005)
* Mary Lo (BBS 2007)
* Carrie Yau (SBS 2009)
* Lam Chiu Ying (SBS 2009)
* Kevin Ho (GBS 2009)

GBS = Gold Bauhinia Star
SBS = Silver Bauhinia Star
BBS = Bronze Bauhinia Star

Thursday, May 21, 2009

B71 #88: Lunch on June 19, 2009

Lunch on June 19, 2009 at Summer Palace of HK Shangrila Hotel in Admiralty.

Table at 12:30 pm booked under Mr. Sin.

* Kevin Ko
* Philip Chow
* Edward Sin
* Christopher So
* David Yam
* David Yau
* Clara Fung
* Lilian Kwan
* Wu Dick Kin
* Leung Wing Kwong
* CY Lam
* Gilbert Wong
* Anthony Wu


Subject:50 歲以上 應酬聚餐最好安排中午!

具有西醫與中醫雙重背景的郭家欣醫師,今年 3 月 24 日在溫哥華台加文化協會演講時指出,50 歲以上的人,睡覺前 4 小時最好不要進食,晚餐應該在 6 時前結束。因此,有交際應酬,最好排在中午。



吃完飯後 4 小時再上床,是最理想的,如果實在很累不躺不行,就採取半臥躺方式,例如,躺在搖椅上休息,就是不要平躺。

郭家欣在台灣是婦產科與家醫科專科醫師,執業近 30 年。移民後他又就讀中醫學院,取得卑詩省中醫師執照,目前經營華美診所。他的養生講座兼具中西醫的學理基礎,極受聽眾歡迎。


每天維持 10 點鐘就上床睡覺,清晨即起的郭家欣指出,年輕人是故意晚睡,愈夜愈美麗。熬夜加上社會面的問題,有時會引起焦慮症與憂鬱症。


早睡早起,加上以 3 : 2 : 1 比例吃三餐,是健康的基礎,大家幾乎都知道,卻不一定會去做。早上不吃,晚上卻吃自助餐,完全背道而馳。「很多人說癌症是吃出來的,飲食是重要原因。」他說。(註:如果早睡的話,晚餐吃得少也不會餓;熬夜的話,易餓不說,吃宵夜就更糟了!)

他說,1980 年代,他剛從醫學院畢業時,美國人的乳癌罹患率是台灣的一千倍,那時候大家認為台灣人的基因不容易得乳癌。現在,台灣不但趕上美國,而且超越,這表示基因的因素很小,是因為飲食改變。

他主張「50 歲以後不要固執一天吃三餐,可以吃五、六餐,每餐只吃半飽,飲食中 60% 是蔬菜,20% 是水果,20% 澱粉,10% 蛋白質。青赤黃白黑五形蔬菜通通要吃,可以照顧肝心脾肺腎,儘量選當季當地蔬果,坎具最好用不銹鋼。」

Friday, April 17, 2009

B71 #87: HKU Bricks Donation



from Edward Sin
to BSc 71 graduates
date Thu, Apr 16, 2009 at 1:52 PM
subject HKU Donation Campaign

HKU has been running a Bricks Campaign to seek donation for building its Centennial Campus which will be completed in 2012.

For donation of HK$18,000, we can have a 4" x 8" brick erected with description of our choice.

Although some of you may have donated your own brick, I would suggest our class of 1971 to donate one. Then I shall promote other graduation years to do the same.

For the HKU Science 70th anniversary celebration, the Alumni Liaison Subgroup (where I am serving) has contacted science alumni from 1967 to 2008 and established coordinators for each graduation years.

I contributed more than any other subgroup members, and made the finishing touch of finding the coordinators for the last two missing years.

If all the 42 graduation years are donating, there will be at least 42 bricks, and we can design a pattern to group and arrange the bricks together.

Grateful if you will express your view.

Edward Sin




* Grace Ho (version 2)
* David Yam (version 2)
* Choi Ho Pang, Raymond (version 2)
* Kevin Ko (version 2)
* Leung Shin Yee, Patty (version 2)
* Cheung Foon Hung (version 2)
* Lam Chiu Ying (version 2)
* David Yau (version 2)
* Anthony Wu (version 2)
* Gilbert Wong (version 2)
* Robert Lam (version 2)
* Chu Pui Hing (veriosn 2)
* Lily Yeung (version 2)
* Henry Leung (version 2)
* Lo Mun Ling (version 2)
* Grace Tao (version 2)
* So Man Wan (version 2)
* Wu Dick Kin (follows majority view)
* Philip Chow (follows majority view)
* Carrie Willis
* William Ho
* Lilian Kwan
* Chung Yip Wah
* SC Leung
* Judy Lam
* Lam Ka Tat
* Clara Fung
* O Wai Sum
* Cheng Chi Leung
* Tang Chee Poon
* Chung Wing Hin
* Ferdinand Ho

Sunday, March 01, 2009

B71 #86: Linkage to BSc 67 graduates

Reply from Chee Cheong CHOI

Dear Mr Sin

Thank you for your msg. Pleased to know that you are a long-time friend of Dominic Lee Tat-on, who is one of my best friends.

I am delighted to render my assistance requested. It is a role which any science alumnus would be pleased to take up. The 1967 cohort has been keeping in touch in recent years by email although we have not been able to track down all former classmates. I shall keep them posted.

I shall also get in touch with someone in the 1965, 1966 and 1968 cohorts. I am sure they will come up with a representative to set up the network if they have not already done so. I shall revert to you asap.

BTW, I intend to attend the gathering schedule for 20 March. I look forward to seeing you and other folks.

Best wishes.

Choi Chee-cheong

2009/2/28 Edward Sin

Dear Mr. Choi,

I know Dominic Lee Tak-On for more than 30 years as we both worked in the insurance field.

The HKU Science Faculty will be celebrating its 70th anniversary in 2009. It would like to take this opportunity to re-unite with all alumni.

I am a 1971 graduate, and am assigned the responsibility to contact senior alumni graduated before 1971. Your name is given to me by Dominic Lee, as you have actively served as class representative of 1967 graduates for a number of years.

The Science Faculty has a website for the 2009 celebration, at:

To facilitate liaison work, I have also created a supplementary website (with permission from the Science Faculty), at:

You are most welcome to call me at 9379-3240 so that I can provide any information you need.

Grateful to hear from you at your earliest convenience.

Edward Sin Wing Sang

B71 #85: Integrate horizontally to all HKU 71 graduates

From: Shelley Lee
Date: Thu, Feb 26, 2009 at 11:37 PM
Subject: Re: HKU 71 alumni group
To: Edward Sin

We (the HKU 71 alumni group) shall be having lunch on 13 March at 12:45pm at the Chinese restaurant, Chariot Club, 3/f, Melbourne Plaza.

Other girls will include Annie Liang Bentley, Sharon Au Evans, Tisa Ho, Louisa Li, Mitzi Leung, Pat Yeung and others.

Usually around 9 or 10.Even if you could not find others, you'll be just as welcome.



* Edward Sin
* Raymond Choi
* Kevin Ko

B71 #84: Integrate vertically to all years BSc alumni


我們是香港大學理學院七十周年校友聯繫工作小組(Alumni Liaison Subgroup)的組員,冒眛給你寫信,是因為今年是母校理學院成立70周年的誌慶, 母校將特別組織一連串慶祝活動,廣邀各屆畢業同學參加。詳情請參閱附件「香港大學理學院七十周年活動一覽表」,或瀏覽理學院七十周年網頁


為了讓各位參與聯絡和組織的同學可以互相認識和交流, 組委會將於3月20 日(星期五)下午 6 時半 至 8 時 舉行一個簡介會,地點將容後通知,希望你能撥冗參加。

如有任何疑問,請隨時與我們的組員冼永生(Edward)聯絡,聯繫電話是9379 3240,電郵。同時請你填妥以下回條, 並傳真到香港大學理學院(2858 4620)或電郵到。謝謝﹗

冼永生(1971) 潘燦國(1973) 蔡素玉(1974)
嚴日昌(1977) 李麗蘭(1982) 侯嘉敏(1983)
馬滿洲(1990) 吳鹿朋(1997) 黃榮基(2002)

致︰香港大學理學院 (傳真︰2858 4620)

本人___________________ 願意 / 不願意 成為 ________年畢業同學的總聯絡

本人 會 / 不會 參加 3月20日的聚會

電話: __________________,

Thursday, February 26, 2009

B71 #83: HKU Science 70th Anniversary Dinner

from C Y Lam

Dear BSc 1971 classmates,

The Faculty of Science will hold its 70th anniversary dinner on Sunday 15 November 2009.

Please let me know if you are interested in joining the dinner. I shall book a table in any case.

In case we have classmates coming back from overseas around that time, it might be possible to organize a couple of additional activities.

Visit the following website to find out more details about this event (and other anniversary celebration activities):

Chiu Ying

* 13 Participants as informed to HKU
陳秋敏 CHAN Chiou Min Clara Ann
張歡鴻 CHEUNG Foon Hung
蔡浩澎 CHOI Ho Pang, Raymond
鄒耀華 CHOW Yiu Wah, Philip
關利平 KWAN Lee Ping, Lilian (replacing 高志超 KO Chi Chiu, Kevin)
林超英 LAM Chiu Ying
冼永生 SIN Wing Sang, Edward
蘇曼雲 SO Man Wan
蘇定光 SO Ting Kwong, Christopher
任懿君 YAM Yee Kwan, David
邱霜梅 YAU Sheung Mui, Carrie (sits at other table)
楊月明 YEUNG Yuet Ming, Lily
Clement LAM (husband of Lily YEUNG)

Sunday, January 18, 2009

B71 #82: Coriolis effect

During our re-union gathering on December 28, 2008, the subject of Coriolis effect was raised and discussed. It leads to the following finding:

a) that the Earth's Coriolis effect (an effect of differential surface velocity) is theoretically true (see Part 1).

b) that the Earth's Coriolis effect is hard to demonstrate as it requires a large bath/pool 2 yards across, to drain through a pin-hole for 12-15 minutes before the effect can be seen (see Part 2).

c) that we can emulate the Coriolis effect by rotating a half globe on a platform (see Part 3).

I would await some interested parties to assemble an experimental unit.

///// Part 1: Explanation of Coriolis effect /////

Blog version:

Website version:

///// Part 2; The lack of good demonstration kit /////

Website discussing the difficulty of setting up an Ideal Sink experiment:

Can You Detect The Coriolis Effect in your Sink?
Dr Karl Kruszelnicki, University of Sydney, Australia

Chris - What we've been doing this evening is asking people all around the East of England to fill sinks and baths with water, pull out the plug and see which way the water swirls down the plug hole. We've got a mixture of results this evening, but is this experiment actually possible? Can we detect the spinning of the Earth using this approach?

Karl - You can get it to work. However, you're looking at a thing called the Coriolis force, which is actually angular momentum under a different name. The Coriolis force on the small bodies of water you're working on is roughly 10 million times smaller than the gravity force, so you really need to do the experiments delicately. Let's just back up a bit here. The thing about angular momentum is the same as when ice skaters go faster when they pull their hands into their body. They speed up because they bring more of their mass to the spin axis of the body. If you think about the Earth spinning, at the equator it's a long way from the spin axis, and at the poles it's right on the spin axis. If you get a storm brewing just above the equator, they spin and move away from the equator towards the poles. As they do so, they head towards the spin axis of the Earth. There's a bit of angular momentum that needs to be accounted for. If you do the equations, this leads to clockwise rotation of a hurricane in the southern hemisphere and anticlockwise rotation in the northern hemisphere. But here you're looking at something tens or hundreds of kilometres across. How can you hope to see that same effect in a tiny tub? The answer is that if you do the experiment very carefully, you should be able to see it. This has been done once or twice.

Chris - So it is possible?

Karl - Yes. In a fine journal called Nature in 1962, there was a paper by Shapiro who did the experiment at MIT. A few years later at the University of Sydney, also published in Nature, a paper by Trefethen in 1964 about the bath tub vortex in the Southern hemisphere. What you do is get a special bath tub, which is two yards across, six inches deep and has a tiny tiny central hole. You put a cork there so you can see which way the water's going. You let the water settle for a day or two so you lose all the residual spin from putting it in there and then you open the drain plug. The water begins to flow out very slowly and nothing very significant happens for about twelve to fifteen minutes. At around that stage, you can begin to see the cork take on a clockwise or anticlockwise rotation depending on your hemisphere. It happens slowly at first and then increases to one rotation every four seconds by the end. Shapiro wrote that when all the precautions prescribed were taken, the vortex was invariably in the anti clockwise direction. Soif you're a fair way away from the equator and you it carefully, you can see it. However if you just rush off the plane at Singapore which is one degree from the equator, and the surface of the Earth is about parallel to the spin axis, put some water in an oval bowl and pull the plug straight out, you're only going to see local effects.

Chris - So in other words, Michael Palin was fooled into thinking this was true at the equator.

Karl - Mate, there's an old Polish saying. If you've got a dog, don't bark. It's fairly obscure, but what it means is stick to your speciality. The number of areas of ignorance we have are huge. In this particular case in the TV series Pole to Pole, Michael Plain meets a man called Michael McCleary, who says that this line here on the ground is the equator. He has a little square tub which he's holding in his hands with floating matchsticks. He then walks off in one direction and spins as he turns around to face the tourists. That gives a spin to the water. He takes his finger off the bottom and you can see the matchsticks going round clockwise or anti clockwise as he's being told. Poor Mr Palin is being conned!

Chris - It just goes to show that even the great Michael Palin can be conned sometimes. Thanks very much for joining us Dr Karl and helping us to avoid throwing out the baby with the bath water and debunking the myth of the Coriolis effect and how it effects spin when water goes down the plug hole.

December 2005

///// Part 3 Suggested demonstration kit /////

I would suggest to use a rotating platform to rotate a double-layer half globe on a cylindrical upright pillar, with the following set-up.

Set-up 1: Pin-ball experiment

1a) While the platform is rotating from west to east, shoot a pin-ball from the equator to the north pole along the zero meridian. We predict that it would deflect to the right. If there are three holes at the 45 degree latitude, namely one at the zeroth meridian, one on the right and one on the left, the pin ball would "fall" into the right hole.

1b) If a pin-ball is shot from the north pole along the zero meridian to the equator, it will "fall" into the left hole.

1c) If similar arrangement is mounted on the cylindrical part, both balls will "fall" into the zeroth meridian hole.

1d) If we reverse the rotation of the platform from east to west, in the half globe, the ball shot from the equator will fall into the left hole and the ball shot from the north pole will fall into the right hole (different from (a) and (b)). In the cylindrical column, all balls will fall into the zeroth meridian hole (same as in (c)).

Set up 2: Air suction

2a) In the inner globe of the double layer, punch four holes:
(i) a hole at the north pole,
(ii) a hole in the equator at the zeroth meridian,
(iii) a hole in the 45 degrees north latitude and the 45 degrees east longitude,
(iv) a hole in the 45 degrees north latitude and the 45 degrees west longitude.
2b) If we punch punch a hole in the outer globe of the double-layer at the position of zeroth meridian and 45 degrees north latitude, air will be centrifuged out of the globe while the globe rotates. We can put sensors around the hole for detecting air current.

2c) Instead of punching a hole in the outer globe, we shall punch a hole in the inner globe at the same position (zeroth meridian and 45 degrees north latitude), and use a pump to pump air out of the double-layer there. The sensors in (b) will detect the current flow, which according to Coriolis effect should be in counter-clockwise direction.

2d) If we install similar things on the cylindrical column as a control experiment, the air flow direction may not form a pattern.

2e) If we reverse the direction of the rotation, we would expect the air flow in (c) will be in clockwise direction. Again, the control experiment installed in the cylindrical column will not display a clear pattern.

Set up 3: Water flow

3a) Mount two water reservoirs at the equator (called them the left and right side of heart), linked with pipe to enable water flow in-between.

3b) Mount two water reservoir at the north pole (called them the left and right side of the cerebrum), again linked with pipe to enable water to flow in-between

3c) Use a rubber tube (right tube) to connect the water outlet at the right heart to the water inlet at the right celebrum.

3d) Use a rubber tube (left tube) to connect the water outlet at the left celebrum to the water inlet at the left hear.

3e) Use a pump to pump water from the right heart upwards. Water would flow upward along the right tube to the right celebrum, then to the left cerebrum, fall down along the left tube to the left heart and return to the right heart to complete the circulation.

3f) As the globe rotates from west to east, the right tube will bulge to the right, and the left tube will bulge to the left, leaving a hollow for the anti-clocwise cyclone to form, as predicted by the Coriolis effect.

3g) Suggest to clamp the rubber tubes in place, activate the pump to circulate the water, then rotate the globe. When condition stabilizes, release the clamp and observe how the rubber tubes will bend. For better effect, install sensors to detect the bending of the rubber tubes. One form of sensor is to use florescent water and transparent rubber tubes, so that we can observe the bending of the rubber tubes without having to stop the globe from rotating.

3h) If we change the direction of the rotation, we would expect that rubber tubes to bend towards each other instead of bulging out.

3i) The control experiment installed at the side of the cylinder would not display the bending effect.

3j) To demonstrate the effect side by side, we may install similar water inlet and outlets at the 180 degrees meridian with water pumped up along the left rubber tube and water returning downward along the right rubber tube. It is predicted that the opposite effect of (3f) and (3h) would be observed.

Set up 4: Further improvement

4a) It may be desirable to divide the the globe and the cylinder into 4 compartments, two for the water pipes, one for the pin-ball and one for air flow.

4b) It may also be desirable to change the half globe design to a pyramid design (with a square base) to house the 4 compartments.

4c) It may also be desirable to build two units, one rotating from west to east (to emulate the northern hemisphere), and the other rotating from east to west (to emulate the southern hemisphere). If successful, this will explain everything in one go.

Thursday, November 27, 2008

B71 #81: Terence Tao

Message from David Yau:

Again,余等同窗子裔又添榮顯,眾 Uncles & Aunties 與有榮焉,除對梁同學蕙蘭衷心道賀,懇請冼同學永生把此佳訊上 Blog,以公告天下!

美國最聰明青年科學家 華裔陶哲軒位居榜首


美國《探索》(Discover)雜誌選出二十名四十歲以下美國最聰明的科學家(20 Best Brains Under 40),其中排首位的數學家和排第十位的電子生物工程師都是華裔科學精英。

排首位的 33 歲華裔數學家陶哲軒(Terence Tao)智商高達 220,在澳洲出生,他 8 歲參加美國高考學術評估測驗(SAT)數學科獲得 760 分的高分,只差 40 分就滿分(在美國,十七八歲的學生中只有 1% 能夠達到 750 分,而 8 歲的孩子裏面還沒有人超過 700 分),24 歲更成為加州大學洛杉磯分校史上最年輕的數學教授,前年獲得「菲爾茨獎」(Fields Medal),這是一項專為四十歲以下傑出科學家頒發的「數學界諾貝爾獎」。會說粵語但是不懂書寫中文的陶哲軒,在有關壓縮感知方面的研究,可以應用在磁力共振、天文以及數碼相機等成像技術上。

最聰明科學家排第十位的是 36 歲的楊長輝(Changhuei Yang),目前任職加州理工學院電子工程與生物工程師。目前主力研究製作廉價耐用、方便攜帶的「超小顯微鏡」,他希望將來可更多應用在發展中國家,方便醫生驗血和檢驗水質。



1. A complimentary quote:

"Terry is like Mozart -- except without Mozart's personality problems," said John Garnett, professor and former chair of mathematics in the UCLA College. "Mathematics just flows out of him." "Mathematicians with Terry's abilities appear only once in a generation," said Garnett. "He's probably the best mathematician in the world right now. Terry can unravel an enormously complicated mathematical problem and reduce it to something very simple. We're amazingly lucky to have him at UCLA."

2. A video spotlight on Terry Tao:


Wednesday, November 26, 2008

B71 #80: Reunion trip to HKU

BSc 71
Reunion Activities on 2008.11.07 - visit to HKU and Reunion Dinner at the Graduate House

Report from Grace Ho:
I have enjoyed a great afternoon visiting various Science Departments in HKU and a good dinner at the Graduate House on November 7, 2008. The visits to the Eliot Hall and the Lily Pond have brought back a lot of sweet memories.

It was wonderful to meet over twenty classmates, some of them I have not met for decades, such as Cheung Foon Hung, as well as Wu Kam Chu who has returned from Canada and Leung Wing Hong from New Zealand for the special occasion.

For those who could not manage to join the reunion activities, I hope the photos allow you to have a taste of the happy atmosphere that we have shared.


Photo 1: The Eliot Hall

Photo 2: Briefing by Prof. A. Cheung

Photo 3: BSc 71 Reunion HKU visit participants

Photo 4: The Telescope

Photo 5: On the way to Eliot hall

Photo 6: Inside Eliot Hall 1

Photo 7: Inside Eliot Hall 2

Photo 8: Outside Eliot Hall

Photo 9: What's left of the Lily Pond

Photo 10: By the Lily Pond

Photo 11 Girls by Dr Sun Yat-sen's Statue

Photo 12 Inside the Greenhouse

Photo 13: Talk in the Geological Museum

Photo 14: Visiting the Geological Museum

Photo 15: Reunion Dinner in Graduate House 1

Photo 16: Reunion Dinner in Graduate House 2

Photo 17: Reunion Dinner in Graduate House 3

Photo 18: Group photo in Graduate House

Names of classmates in Group Photo in Graduate House

From left to right:

Back row: Gilbert Wong, Anthony Wu, Kevin Ko, Leung Sze Chung, Lam Chiu Ying, David Yau, Wu Kam Chu, David Yam, Cheung Foon Hung, Philip Chow, Henry Leung, Raymond Choi, Wu Dick Kin, Leung Wing Kwong, Lam Hung Biu

Front Row: Edward Sin, Tse Tsun Him, Clara Chan, Grace Lee, So Man Wan, Lo Mun Ling, So Ting Kwong.

Monday, November 24, 2008

B71 #79: Reunion trip to Chiangmai

BSc71 Reunion Trip to Chiangmai in Thailand November 8-12, 2008

Report from Grace Ho:

Ten of us, under the leadership of Lam Chiu Ying made a trip to Chiang Mai 8-12/11/2008. We went bird-watching, star-gazing, sightseeing and hiking. We visited the Royal Project Botanical Gardens and sampled food cooked with vegetables grown and chicken or pork from pigs raised by the Royal Project. We visited villages with ethnic people and enjoyed a very interesting elephant show at the Maesa Elephant Camp.

Weather was excellent and the sceneries very beautiful. It was a fantastic trip with excellent company. I would like to thank Chiu Ying and Man Wan for their superb organization and help to make the trip such a great success!


Photo 1: Dinner in Chiangmai

Photo 2: Doi Pui

Photo 3: Doi Pui Summit

Photo 4: Lunch in Village

Photo 5: Royal Project Greenhouse 1

Photo 6: Royal Project Greenhouse 2

Photo 7: Royal Project Garden

Photo 8: Shopping in market

Photo 9: Chiu Ying Having Fun

Photo 10: Raymond getting ready

Tuesday, November 11, 2008

B71 #78: Dinner on December 28, 2008

To celebrate our 40th anniversary since entry to HKU, we have a part 2 dinner scheduled on December 28, 2008.

Lilian Kwan has kindly arranged her secretary to book the City University Shing Hin Restaurant (on the 9th Floor of City Top) for our gathering as well as for Lily Yeung's art exhibit.

Dinner starts at 8 pm. Lilian (9261-5601) will be there to await your arrival from 6:30 pm onwards.

Hope you can join.

Participation (family members are welcome)
* Lily Yeung + son, Edmund Lam
* Grace Leung + husband, Billy Tao
* Judy Chu
* Stephen Lam
* Chan Hing Chung
* Henry Leung
* Lam Chiu Ying
* So Man Wan
* Edward Sin
* Clara Chan
* David Yau
* Cheung Foon Hung
* Leung Wing Kwong
* Robert Lam
* David Yam Yee Kwan
* Lilian Kwan (left before dinner)

Here is a list of photo albums contributed by classmates

David Yau's album:

Stephen Lam's album:

Lily Yeung's album:

Clara Chan's album:

Group Photo:

Standing Row
(from left)
David Yau Man Tak
Chan Hing Chung
David Yam Yee Kwan
Henry Leung Wing Hong
Edward Sin Wing Sang
Robert Lam Hung Piu
Cheung Foon Hung
Leung Wing Kwong

Sitting Row
(from left)
Lam Chiu Ying and So Man Wan
Grace Leung Wai Lan and Billy Tao
Lily Yeung Yuet Ming
Clara Chan Chiou Min
Judy Chu Wah Yuk and Stephen Lam Ka Tat

Saturday, November 08, 2008

B71 #77: Photos of Re-union (from Clara Chan)

You are invited to view a photo from Clara's photo album:
BSc 71 - HKU Tour (相識四十載)

Message from Clara:
I enclose some photos taken at today's tour around HKU. Can you tell the buildings?

I can assure you that there are lots and lots of buildings. There is so much concrete that the place bears little resemblance to the good old campus where we spent some of our best years.

B71 #76: Photos of Re-union on November 7, 2008

Photo taken with the telescope in the Physics Building

Photo of 3-Dimension slide show in the Earth Science Museum