Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Metal body and parts/ Synthetic control handle and parts/ Glass optical element

Dimensions

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

Longueur

42,0 cm

Largeur

28,0 cm

Hauteur

21,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Physique

Catégorie

Lumière et radiation électromagnétique

Sous-catégorie

S/O

Fabricant

Ou

Inconnu

Pays

Canada

État/province

Ontario

Ville

Richmond Hill

Contexte

Pays

Canada

État/province

Ontario

Période

late 1950s+

Canada

An instrument 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

An instrument used in an astronomical observatory to measure the brightness of stars, galaxies and other astronomical bodies with great accuracy

Technique

This is a late 1950s simple single channel photometer with 1P21 photoelectric tube. It is one of several photometers in this collection which show the development from the simplest (this one, which was probably built prior to Fernie's arrival at DDO) with a single PM tube, to those with multiple tubes monitoring the sky and star simultaneously to the set used in recent years simultaneously on both the 19 and 24 inch telescopes [2008.0197 and 2008.0198] on the DDO administration building.

Notes sur la région

Inconnu

Détails

Marques

Pressure printed (Dymo) labels provide instructions/ Black printed yellow labels read '0', '1', '2', ' P'

Manque

Unknown

Fini

Body painted glossy medium blue with grey painted parts (now fragile and lifting off)/ Black and white synthetic parts/ Gold coloured metal parts/ Colourless transparent glass

Décoration

S/O