Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Wood case with glass front, top and sides, felt covered floor/ Metal chassis, brass drum/ Ceramic, metal and synthetic electrical components

Dimensions

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

Longueur

90,0 cm

Largeur

41,2 cm

Hauteur

39,5 cm

Épaisseur

S/O

Poids

50,0

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Astronomie

Catégorie

Divers

Sous-catégorie

S/O

Fabricant

Ou

Genevoise

Pays

Switzerland

État/province

Inconnu

Ville

Geneva

Contexte

Pays

Canada

État/province

Ontario

Période

Inconnu

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 to detect and measure the intensity and direction and duration of movements of the ground (such as in an earthquake).

Technique

An early 20th century seismograph possibly used at the David Dunlop Observatory for unknown purposes. Its drive mechanism has been modified from mechanical to motorized. The instrument may date to the period of the Blair St. Observatory of the Meteorological Service of Canada.

Notes sur la région

Inconnu

Détails

Marques

Three black plates with gold lettering on back? read 'MADE IN SWITZERLAND', 'SOCIÉTÉ GENEVOISE/ POUR LA CONSTRUCTION/ D'INSTRUMENTD DE PHYSIQUE/ GENEVA' and 'James G. Biddle/ Philadelphia'

Manque

Unknown

Fini

Dark stained wood case with colourless transparent glass, green floor covering/ Black painted chassis and parts/ Gold coloured drum and mechanism/ Gold coloured and black painted recording mechanism with green covered wire on coils and green covered connecting wire/ White ceramic part/ Multicoloured synthetic parts, metallic parts, unfinished wood parts

Décoration

S/O