Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

5

Ou

S/O

Brevets

S/O

Description générale

metal casing and parts/ glass slide

Dimensions

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

Longueur

79,5 cm

Largeur

S/O

Hauteur

S/O

Épaisseur

S/O

Poids

S/O

Diamètre

12,6 cm

Volume

S/O

Lexique

Groupe

Météorologie

Catégorie

Mesure de température de l'atmosphère

Sous-catégorie

S/O

Fabricant

Ou

GM

Pays

United States of America

État/province

New York

Ville

New York

Contexte

Pays

Canada

État/province

Inconnu

Période

1970s; this instrument was apparently in use for 45 years (Ref. 4)

Canada

A bathytherrmograph possibly of a type used by the Meteorological Service of Canada to gather ocean temperature data. Part of a large collection of meteorological instruments acquired from the Meteorological Service of Canada (previously Atmospheric Environment Service) by the CSTM since 1967. MSC is the government agency responsible for collecting and disseminating meteorological data and forecasts in Canada. It was founded in 1871 in Toronto where it is still headquartered. The MSC was originally on the University of Toronto downtown campus but moved to Downsview in 1971 on land owned by UofT. The headquarters houses laboratories, research facilities and calibration and instrument maintenance facilities (now largely contracted out).

Fonction

An instrument for obtaining, from a ship under way, a record of temperature against depth (strictly speaking, pressure) in the upper 300 m of the ocean.

Technique

A specialized temperature recorder for use at moderate ocean depths, consisting of a thermal element connected to a recording mechanism, within a torpedo shaped casing. The bathythermograph was lowered into the sea and retrieved by means of a wire rope and could be operated when the ship was underway at speeds up to 18 knots. The thermal element of the bathythermograph consists of a xylene-filled copper coil, which actuates a stylus through a Bourdon tube. The pressure element is a copper aneroid capsule that moves a smoked glass slide at right angles to the motion of the stylus. A double analog record is thus obtained as the BT is lowered and recovered. Once removed, the slide is placed in a magnifying viewer to be read against a depth/ temperature grid in the viewer. This type of device has generally been replaced by the expendable bathythermograph (XBT) for use up to 1800 m., in which the temperature data read by a thermistor and transferred by a fine wire to a shipboard recorder (Refs.1-2).

Notes sur la région

Inconnu

Détails

Marques

label reads 'GM MFG. COMPANY/ NEW YORK 3, NY/ Cat. No. 202.A130/ Model No. #3091/ Type: 125 Meter/ Bathythermogr...' [last letters missing]

Manque

unknown - appears complete

Fini

grey painted casing tip/ copper coloured body with gold coloured sleeve/ other finishes obscured by corrosion

Décoration

S/O