Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

7

Ou

S/O

Brevets

S/O

Description générale

Metal (including brass), glass

Dimensions

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

Longueur

109,0 cm

Largeur

61,0 cm

Hauteur

25,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Astronomie

Catégorie

Équipement d'observation

Sous-catégorie

S/O

Fabricant

Ou

Cooke

Pays

Inconnu

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Inconnu

Période

ca. 1900-1940

Canada

One of the primary instruments used to determine time. It is not know if this particular instrument was solely used in Ottawa or as a primary survey transit for first order triangulation mapping projects. If the latter, it would have been used to determine the longitude of the primary reference points. If/when used in Ottawa, it would have been used to determine the time of Ottawa used as the primary or secondary instrument to define standard time for Canada and to determine the slowing or speeding up of the Earth. This is a typical astronomical transit telescope with design features having appeared in Troughton & Simms transits ca. 1850.

Fonction

Used to measure the passage of stars across the meridian in order to precisely determine the local time.

Technique

The transit telescope is a moderate sized instrument made by the best manufactures of the day. The transit telescope first appeared ca. 1705 in Denmark having been created by Ole Romer. The instrument is different from other astronomical telescopes in that its axis is constrained to move in the N-S plane of the sky through the zenith. They were designed to be reversed on the axis in order to observe and correct errors in the alignment of the axis.

Notes sur la région

Inconnu

Détails

Marques

.3 Dial marked off from 0-90. .4 Engraved 'T. COOKE & SONS LTD./ LONDON & YORK' & '2'; Dial on side marked off from 0-90 and circle on face marked off from 0-40; An arrow and 'OUT' can be seen on inner pt. .8 Label on crate reads: "ASTRONOMICAL INSTRUMENTS/ WITH CARE'

Manque

From CA of 01/18/2002 by Matthew Bruce: No - appears complete

Fini

.1 Brass-coloured & painted black, silver-coloured eyepiece/ .2 Brass colour/ .3 Brass-coloured, some bright, some tarnished-looking areas, some black & some dull red pts/ .4 Brass colour with black pts/ .5 Brass-colour, appears black inside/ .6 Painted black, brass colour on ends/ .7 Painted black, brass-coloured pts./.8 Painted dark brown.

Décoration

S/O