Renseignements généraux

Nº de série

6901-79

Nº de partie

4

Nombre total de parties

4

Ou

S/O

Brevets

S/O

Description générale

Metal casing and parts/ Synthetic wire covering and parts/ Glass and synthetic dial casing

Dimensions

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

32,5 cm

Largeur

31,5 cm

Hauteur

30,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Astronomie

Catégorie

Divers

Sous-catégorie

S/O

Fabricant

Ou

Products

Pays

United States of America

État/province

Massachusetts

Ville

Danvers

Contexte

Pays

Canada

État/province

Ontario

Période

Inconnu

Canada

A piece of equipment used at the David Dunlap Observatory at the University of Toronto, one of Canada's most important astronomical observatories. The David Dunlap Observatory opened in 1935 as the result of a bequest from the wife of David Dunlap. The telescope was a 74 inch (188 cm) reflector built by Grubb Parsons of Newcastle-upon-Tyne in England. The 74 inch was then the largest telescope in Canada (surpassing the 72 inch telescope of the Dominion Astrophysical Observatory in Victoria) and became the second largest in the world after the 100 inch Hooker Telescope of the Mt. Wilson Observatory outside Los Angeles. DDO's reputation grew and following WWII, it began to graduate most of the astronomers produced in Canada with University of Western Ontario far behind. Beginning in the 1960s a number of other astronomy departments were created but UofT/DDO held its place, a position it probably still holds. The DDO had a good technical staff which gave them an advantage and, with most of the 1940s to early 1970s top astronomers coming from UofT, grants from NRC and then ENSERC were almost guaranteed and allowed UofT's top astronomers -- Hogg, van den Berg, Fernie, Bolton, Kamper, Martin, etc. to acquire or build some of the best equipment available in university observatories. For optical observatories, only the DAO had technical staff and budgets that surpassed those of DDO. In 2007, citing increasing light pollution, the University of Toronto announced plans to sell the Observatory property. In June 2008, it was sold to Corsica Development Inc., a subsidiary of Metrus Development Inc. and the Observatory was closed. In 2009 the Observatory buildings and 80% of the site were designated a cultural heritage landscape. Also in 2009 Corsica and the Royal Astronomical Society of Canada, Toronto Centre announced an agreement allowing the RASC to provide public education and outreach programs at the observatory, and to operate the 188 cm telescope.

Fonction

A cooling device used to control the temperature of the photomultiplier tube of an astronomical photometer.

Technique

A piece of equipment used by Dr. Don Fernie with his dual photometer. It contains a refrigerated chamber used to maintain the photomultiplier tubes of a photometer at a low temperature-- typically -40 C. The reason is that photomultiplier tubes are more efficient the colder they are and more stable. The tubes most frequently used were RCA tubes.

Notes sur la région

Inconnu

Détails

Marques

Label on one side reads 'Refrigerated Chamber/ MODEL TE-211RF-01/ Ser. No. 6901-79/ PRODUCTS FOR RESEARCH, INC./ 78 Holten St., Danvers, Mass./ Made in U.S.A.'/ Labels on each side read '[logo] Photomultiplier Tube Housing/ PRODUCTS FOR RESEARCH, INC./ Made In U.S.A.'

Manque

Unknown

Fini

Textured black painted finish on two sides of casing and cover; brushed metal on two sides, top and underside/ Metallic grey parts/ Red and black synthetic parts/ Metallic temperature dial with black indicator needle, in black synthetic and colourless transparent glass casing/ Plated parts

Décoration

S/O