General Information

Serial #

N/A

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

NON-FERROUS METAL, PROBABLY COPPER

Dimensions

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

Length

N/A

Width

N/A

Height

9.7 cm

Thickness

N/A

Weight

N/A

Diameter

13.1 cm

Volume

N/A

Lexicon

Group

Forestry

Category

Fire fighting

Sub-Category

N/A

Manufacturer

AKA

Ottawa Brass

Country

Canada

State/Province

Ontario

City

Ottawa

Context

Country

Canada

State/Province

Unknown

Period

1930'S & 1940'S

Canada

EVAPORATION MEASURING DEVICE DESIGNED BY MEMBERS OF CANADIAN FORESTRY SERVICE & BY CANADIAN (OTTAWA) FIRM./ FROM COLLECTION OF FORESTRY & FIRE-FIGHTING EQUIPMENT FROM PNFI, CANADIAN GOV'T FORESTRY-RESEARCH ESTABLISHMENT WHICH OPERATED FROM 1918-1995. PNFI STUDIED SPECIES GROWTH & FOREST MANAGEMENT, PARTICULARLY FIRE PREVENTION & SUPPRESSION.

Function

DEVICE USED TO MEASURE RATE OF EVAPORATION OF WATER BY MEASUREMENT OF LOSS OF WATER FROM SMALL PAN. READINGS WERE COMPARED WITH READINGS FROM LIVINGSTON ATMOMETER, IN LIVINGSTON UNITS WHICH IN 1930'S WERE SCIENTIFIC STANDARD FOR EVAPORATION. THIS EXAMPLE WAS USED BY FORESTRY SERVICE IN DETERMINING RISK OF FOREST FIRE.

Technical

DESIGNED BY JAMES G. WRIGHT OF PNFI, UNDER WHOM RESEARCH INTO FIRE CONTROL BEGAN IN 1929. WRIGHT EVAPORIMETER WAS WIDELY USED BY FOREST PROTECTION AGENCIES UNTIL 1946, WHEN DIRECT READINGS OF WIND, TEMPERATURE & RH REPLACED EVAPORIMETERS. THIS EXAMPLE IS LATER VERSION WITH HEMISPHERICAL BOTTOM & PROTECTIVE SCREEN.

Area Notes

Unknown

Details

Markings

NONE

Missing

APPEARS COMPLETE EXCEPT FOR CATCH ON .2

Finish

PAINTED METALLIC GREY

Decoration

N/A