General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

NON-FERROUS METAL CASING & DIAL, SPIKE/ BURLAP? SENSOR STRIP

Dimensions

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

Length

46.2 cm

Width

12.7 cm

Height

3.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Forestry

Category

Fire fighting

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

GENERALLY: 1920'S+

Canada

FROM COLLECTION OF FORESTRY & FIRE-FIGHTING EQUIPMENT USED BY & ACQUIRED FROM PNFI. FOUNDED IN 1918, IT WAS OLDEST CONTINUOUSLY OPERATING FORESTRY-RESEARCH ESTABLISHMENT IN CANADA UNTIL IT CLOSED IN 1995. PNFI STUDIED GROWTH OF VARIOUS SPECIES & FOREST MANAGEMENT, PARTICULARLY FIRE PREVENTION & SUPPRESSION.

Function

DEVICE TO MEASURE MOISTURE CONTENT OF DUFF (LAYER OF DEAD PLANT MATERIAL ON FOREST FLOOR) IN ORDER TO PREDICT FLAMMABILITY & DETERMINE RISK OF FOREST FIRE.

Technical

EXAMPLE OF SIMPLEST MECHANICAL TYPE OF HYGROMETER. BURLAP STRIP ENCASED IN PERFORATED METAL SPIKE CONTRACTS WHEN RELATIVE HUMIDITY OF DUFF (IN WHICH SPIKE IS PLANTED)INCREASES; STRIP IS ATTACHED TO SPRING & DIAL OR SCALE. MOISTURE CONTENT OF DUFF INDICATES FLAMMABILITY & THUS FOREST FIRE HAZARD.

Area Notes

Unknown

Details

Markings

HAND PAINTED? SCALE FOR.5 TO 7/ BLACK PRINTED "No 42" & "WHITE PINE 1" ON DIAL

Missing

GLASS COVER FOR DIAL

Finish

BLACK WRINKLE FINISH ON INSTRUMENT DIAL CASING/ BRUSHED METALLIC DIAL FACE WITH BLACK PAINTED INDICATOR NEEDLE/ METALLIC PROBE

Decoration

N/A