Isabel Williamson

On 03 Aug, 2013 By walter.macdonal...

(1907-2000) An active member of the Montreal Centre and the driving force behind the observing programs there from the 1940s through the 1960s.

In 1967 the nineteen-year-old David Levy was an enthusiastic observer, and an observationally active member of the Montreal Centre, pursuing his life-long quest for comets, and an ever deeper familiarity with the night sky (activities which he knowledgably, imaginatively, and fruitfully pursues to this day).

Letter 19600626

On 01 Aug, 2012 By walter.macdonal... With 1 Comments

This is a transcription of the letter:

IKW June 26 [1960]

Dear Ruth,

Here are the prints you selected from our Annual Meeting collection. I relied on the list of numbers Mr. MacLennan gave me and hope I haven't made any mistakes. Also enclosed is [a] duplicate of a slide of Dr. McKellar, taken by Constantine [Papacosmos], which we thought was exceptionally good.

GA 1960 #08

On 01 Aug, 2012 By walter.macdonal...

L to R: Isabel Williamson, Vern Ramsay, Constantine Papacosmas, Geoff Gaherty, David Stills.

Jupiter 195907280230

On 16 May, 2012 By walter.macdonal...

Jupiter on 1959 July 27/28 at 22:30 EDT (02:30 UT) as sketched by I.K. Williamson. C.M.(1) 10º, C.M.(2) 342º. 80mm refractor at 173x. Seeing 3. Transparency 3.

Jupiter 195907140330

On 15 May, 2012 By walter.macdonal...

Jupiter on 1959 July 13/14 at 23:30 EDT (03:30 UT) as sketched by I.K. Williamson. C.M.(1) 357º, C.M.(2) 75º. 80mm refractor at 173x. Seeing 3. Transparency 3.

Jupiter 195907080200

On 15 May, 2012 By walter.macdonal...

Jupiter on 1959 July 7/8 at 22:00 EDT (02:00 UT) as sketched by I.K. Williamson. C.M.(1) 75º, C.M.(2) 200º. 80mm refractor at 173x. Seeing 2. Transparency 2. Suggestions of ripples in SEB. Definite dark areas in NEB but only visible for fleeting instances due to poor seeing.

Jupiter 195907040245

On 15 May, 2012 By walter.macdonal...

Jupiter on 1959 July 3/4 at 22:45 EDT (02:45 UT) as sketched by I.K. Williamson. C.M.(1) 191º, C.M.(2) 346º. 80mm telescope at 173x. Seeing 4. Transparency 3.

Jupiter 195906110310

On 15 May, 2012 By walter.macdonal...

Jupiter on 1959 June 10/11 at 23:10 EDT (03:10 UT) as sketched by I.K. Williamson. C.M.(1) 174º, C.M.(2) 144º. 6½" refractor at 222x. Seeing 3. Transparency 2. Humps in N.E.B. quite pronounced.

Jupiter 195905170300b

On 13 May, 2012 By walter.macdonal...

Jupiter on 1959 May 16/17 at 23:00 EDT (03:00 UT) as sketched by I.K. Williamson. C.M.(1) 178º, C.M.(2) 339º. 6½" refractor at 100x. Seeing 4. Transparency 3.