General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

NON-FERROUS METAL FRAME WITH SYNTHETIC HANDLE/ FERROUS METAL RESERVOIR WITH CORK STOPPER/ WOOD SCALE/ GLASS THERMOMETERS/ SYNTHETIC TAPE? USED TO BIND THERMOMETERS TO SCALE/ MERCURY/ FABRIC (COTTON?) WICK

Dimensions

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

Length

28.2 cm

Width

17.8 cm

Height

5.4 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Upper air pressure, temperature & humidity measurement

Sub-Category

N/A

Manufacturer

AKA

JACOBSEN

Country

Canada

State/Province

Northwest Territories

City

Coppermine

Context

Country

Canada

State/Province

Unknown

Period

1933 & AFTER

Canada

MADE & USED BY R.C. JACOBSEN OF MSC (C. 1931-1951). JACOBSEN 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 WHICH HE USED TO MAKE OBSERVATIONS OVER LAKE ONTARIO IN HIS OWN PLANE.

Function

INSTRUMENT FOR DETERMINING ATMOSPHERIC HUMIDITY BY COMPARING DIFFERENT READINGS FROM TWO THERMOMETERS, ONE WITH BULB KEPT WET. THIS EXAMPLE WAS INTENDED TO BE MOUNTED ON AIRCRAFT IN ORDER TO TAKE UPPER AIR HUMIDITY READINGS.

Technical

JACOBSEN DESIGNED & BUILT THIS PSYCHROMETER AT COPPERMINE, NWT, IN 1932, APPARENTLY OUT OF MATERIALS AT HAND. IT HAS WET & DRY BULB THERMOMETERS, & RESERVOIR FOR WATER TO KEEP WICK WET. IT WOULD BE MOUNTED ON EXTERIOR OF AIRCRAFT & MOTION OF AIRCRAFT WOULD PROVIDE ASPIRATION WHILE READINGS WERE TAKEN BY PILOT FROM INSIDE.

Area Notes

Unknown

Details

Markings

HAND INCISED LETTERING ON FRAMEREADS "1933 MADE IN COPPERMINE NWT RCJ/ HAND PRINTED SCALE WITH BLACK MARKINGS & RED NUMBERS FOR -40 TO +90 F./ HAND PRINTED BLACK LETTERING ON RESERVOIR READS "FILL/ FOR EACH/ FLIGHT"/ BLACK SCALE MARKINGS ON DRY BULB THERMOMETER FOR -30 TO +120 F./ BLACK SCALE MARKINGS ON DRY BULB THERMOMETER & LETTERING READING "NPL 30" & "W30677", WITH NEGRETTI & ZAMBRA LOGO

Missing

APPEARS COMPLETE

Finish

GREY FRAME & RESERVOIR/ BROWN HANDLE/ COLOURLESS TRANSPARENT THERMOMETERS WITH WHITE BACKS, ONE WITH RED STRIPE/ METALLIC BULB/ DISCOLOURED WHITE WICK/ YELLOW PAINTED SCALE

Decoration

N/A