Bathythermograph

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OBJECT TYPE
deformation/Bourdon tube/xylene
DATE
1960
ARTIFACT NUMBER
2004.0317.001
MANUFACTURER
GM Mfg. Co.
MODEL
3091/125
LOCATION
New York, New York, United States of America

More Information


General Information

Serial #
N/A
Part Number
1
Total Parts
5
AKA
N/A
Patents
N/A
General Description
metal casing and parts/ glass slide

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
79.5 cm
Width
N/A
Height
N/A
Thickness
N/A
Weight
N/A
Diameter
12.6 cm
Volume
N/A

Lexicon

Group
Meteorology
Category
Atmospheric temperature measurement
Sub-Category
N/A

Manufacturer

AKA
GM
Country
United States of America
State/Province
New York
City
New York

Context

Country
Canada
State/Province
Unknown
Period
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).
Function
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.
Technical
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).
Area Notes
Unknown

Details

Markings
label reads 'GM MFG. COMPANY/ NEW YORK 3, NY/ Cat. No. 202.A130/ Model No. #3091/ Type: 125 Meter/ Bathythermogr...' [last letters missing]
Missing
unknown - appears complete
Finish
grey painted casing tip/ copper coloured body with gold coloured sleeve/ other finishes obscured by corrosion
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

GM Mfg. Co., Bathythermograph, circa 1960, Artifact no. 2004.0317, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0317.001/

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