General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

ALUMINUM FRAME/ NON-FERROUS METAL HANDLE/ GLASS THERMOMETERS/ COTTON MUSLIN WICK/ MERCURY/ LEATHER CASE WITH FABRIC LINING/ GLASS BOTTLE WITH CORK

Dimensions

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

Length

26.7 cm

Width

6.1 cm

Height

3.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Forestry

Category

Silviculture

Sub-Category

N/A

Manufacturer

AKA

Negretti Zambra

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Saskatchewan

Period

1930'S+

Canada

A BRITISH-MADE METEOROLOGICAL INSTRUMENT USED BY THE CANADIAN FORESTRY SERVICE TO MONITOR ATMOSPHERIC-CLIMATIC CONDITIONS. THIS EXAMPLE IS MARKED 'DFS' FOR DOMINION FORESTRY SERVICE, WHICH WAS THE NAME OF THE DEPARTMENT BETWEEN 1936 & 1949 (SEE SUPP.INFO.)

Function

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

Technical

AN EXAMPLE OF A SIMPLE, PORTABLE HUMIDITY MEASURING INSTRUMENT. IT IS TYPICAL OF BRITISH (& CANADIAN) PSYCHROMETERS IN HAVING ARIGID (THOUGH FOLDING) HANDLE & A HEAVY FRAME PROTECTING THE THERMOMETERS. IT APPEARS IN N&Z'S 1938 CATALOGUE

Area Notes

Unknown

Details

Markings

INCISED BLACK 'NEGRETTI & ZAMBRA/ LONOND/ BRITISH MAKE' ON FRONT/ INCISED 'DFS' ON FRONT/ BLACK MARKINGS & SCALES FOR 20 TO 120 F., ONE MARKED ON BACK IN SCRIPT '(British Make)'/ TYPEWRITTEN LABEL ON CASE READS 'SASK. AIR PATROL'

Missing

EXTRA MUSLIN WICKS

Finish

METALLIC FRAME/ PLATED HANDLE/ WHITE COTTON/ CLEAR GLASS WITH WHITE BACK/ BROWN LEATHER & MAROON LINING

Decoration

SUPERIMPOSED 'N' & 'Z' FORMING MFR'S LOGO