Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

2

Ou

S/O

Brevets

S/O

Description générale

Brass casing. Metal face and indicator needle. Glass window. Leather case with velvet lining.

Dimensions

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

Longueur

15,7 cm

Largeur

12,2 cm

Hauteur

5,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Mines et métallurgie

Catégorie

Divers

Sous-catégorie

S/O

Fabricant

Ou

Inconnu

Pays

Inconnu

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Inconnu

État/province

Inconnu

Période

Inconnu

Canada

Example of type of instrument used by the Geological Survey of Canada (GSC). The Geological Survey of Canada was founded in 1842 to determine if the province's resources could support a mining industry. Throughout its long and continuing operation, the survey has charted the geology of Canada (on shore and off), as well as studying the country's topology, flora and fauna, and climate. Not all the GSC's were specifically aimed at supporting the mining and petroleum industries. For example, the survey has helped public works projects and, since the 1980s, conducted environmental-impact studies. This barometer is also significant because it represents one type of Canadian "made" or signed surveying instrument. Often, Canadian sellers of surveying instruments sold foreign made instruments engraved with their own name. This is likely one of those instruments. Harrison & Co. was Thomas H. Hearn's wholesale business, which was run by his son John. Harrison was an instrument maker in Montreal, who was married to, and business partners with, the widow of Toronto instrument maker Charles Hearn. From 1870, they worked together as Hearn & Co. (they were married ca. 1874). They both sold their own instruments and those that were imported. In the 1880s, Hearn & Co. became Hearn & Harrison. Harrison & Co. continued for some time after this date, but was probably folded into Hearn & Harrison at some time.

Fonction

An instrument that measures atmospheric pressure by means of its effect on an aneroid, or metal chamber partially exhausted of air. This type was used in altitude measuring.

Technique

This surveying barometer was specially designed to accommodate mining. Whereas a normal surveying barometer might have an altitude scale that read to 6 000 feet (for example), this scale of this barometer registers 2 000 feet below sea level to 4 000 feet above sea level. It is compensated for temperature and comes with a magnifier.

Notes sur la région

Inconnu

Détails

Marques

Back incised by hand 'G.S.C. No. 70'/ Black lettering on face reads mostly in script 'Surveying Aneroid/ with Mining Scale/ Harrison & Co./ MONTREAL/ Compensated'.

Manque

From CA of 11/15/1993 by Tony Missio: No - Complete

Fini

Original black finish largely worn away. Anodized face. Blued needle. Brown leather case.

Décoration

S/O