General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

WOOD FRAME/ SYNTHETIC HANDLE & WATER RESERVOIR/ GLASS THERMOMETERS/ COTTON WICK/ MERCURY/ METAL SCREWS/ LEATHER CASE WITH METAL HARDWARE

Dimensions

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

Length

22.8 cm

Width

16.4 cm

Height

3.6 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric humidity measurement

Sub-Category

N/A

Manufacturer

AKA

Casella

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Unknown

Period

Unknown

Canada

BRITISH-MADE METEOROLOGICAL INSTRUMENT USED BY GEODETIC SURVEY OFCANADIAN DEPT. OF ENERGY, MINES, & RESOURCES.

Function

INSTRUMENT FOR DETERMINING ATMOSPHERIC HUMIDITY BY COMPARING DIFFERENT READINGS FROM TWO THERMOMETERS, ONE WITH BULB KEPT WET. INSTRUMENT IS VENTILATED BY WHIRLING IT THROUGH AIR.

Technical

EXAMPLE OF SIMPLE, PORTABLE HUMIDITY MEASURING INSTRUMENT. IT IS TYPICAL OF BRITISH (& CANADIAN) PSYCHROMETERS IN HAVING RIGID HANDLE & HEAVY FRAME PROTECTING THERMOMETERS. THIS SPECIMEN HAS WATER RESERVOIR BUILT INTO END OF FRAME, INTO WHICH BULB WITH DIPS, KEEPING IT CONTINUALLY MOISTENED.

Area Notes

Unknown

Details

Markings

BLACK STAMPED 'CASELLA/ LONDON' & 'MADE IN ENGLAND' ON WOOD/ THERMOMETER BACKS MARKED IN BLACK 'MADE IN ENGLAND BS2842/57 Casella London N.F. 32953' or '36810' (Casella London IS IN SCRIPT, SERIAL NOS. HAND INSCRIBED)/ BLACK MARKINGS & SCALES ON FRONTS FOR 20 TO 120 F./ BLACK HANDWRITTEN '1003' IN TWO PLACES ON CASE

Missing

CLASP BROKEN ON CASE

Finish

VARNISHED WOOD/ BLACK HANDLE/ WHITE RESERVOIR/ WHITE COTTON/ TRANSPARENT GLASS THERMOMETER TUBES WITH WHITE BACKS/ BROWN LEATHER/ PLATED & METALLIC PARTS

Decoration

N/A