General Information

Serial #

T718177

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

GLASS THERMOMETER/ MERCURY-THALLIUM/ NON-FERROUS METAL HOLDER

Dimensions

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

Length

36.8 cm

Width

3.4 cm

Height

2.8 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric temperature measurement

Sub-Category

N/A

Manufacturer

AKA

HB

Country

United States of America

State/Province

Pennsylvania

City

Philadelphia

Context

Country

Canada

State/Province

Unknown

Period

Unknown

Canada

FROM THERMOMETER COLLECTION OF R.C. JACOBSEN OF MSC (C. 1931- 1951). HE TOOK PART IN CANADIAN INTERNATIONAL POLAR YEAR EXPEDITION TO COPPERMINE, NWT (1932); WAS INVOLVED IN DESIGN OF MSC RADIOSONDE IN 1930'S; DESIGNED METEO INSTRUMENTS FOR AIRCRAFT WHICHHE USED TO MAKE OBSERVATIONS OVER LAKE ONTARIO IN HIS OWN PLANE.

Function

INSTRUMENT THAT MEASURES LOW AIR TEMPERATURES BY MEANS OF EFFECT OF TEMPERATURE ON COLUMN OF MERCURY-IN-GLASS. MERCURY CONTAINS THALLIUM, WHICH LOWERS ITS FREEZING POINT FOR USE AT VERY LOW TEMPERATURES.

Technical

MERCURY-THALLIUM THERMOMETER FOR LOW TEMPERATURES, MOUNTED IN U.S. ARMY SIGNAL CORPS HOLDER. MERCURY-THALLIUM FREEZES AT -78 WHILE MERCURY DOES SO AT -38 DEGREES F. CANADIAN METEOROLOGICAL SERVICE BEGAN USING MERCURY-THALLIUM THERMOMETERS IN 1948-1949.

Area Notes

Unknown

Details

Markings

BLACK LETTERING ON BACK READING "NITROGEN/ FILLED" & MERCURY/ THALLIUM" WITH MFR.'S LOGO & "T718177"/ BLACK SCALE MARKINGS FOR -70 TO +35 F./ INCISED BLACK LETTERING ON HOLDER READS "SIGNAL CORPS U.S. ARMY ML-352/UM" WITH RED STAMPED "S C/ 320"

Missing

COMPLETE

Finish

COLOURLESS TRANSPARENT TUBE WITH YELLOW BACK/ METALLIC BULB/ METALLIC HOLDER

Decoration

N/A