General Information

Serial #

129

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

NON-FERROUS METAL

Dimensions

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

Length

36.5 cm

Width

N/A

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

9.5 cm

Volume

N/A

Lexicon

Group

Forestry

Category

Fire fighting

Sub-Category

N/A

Manufacturer

AKA

Negretti Zambra

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Ontario

Period

Unknown

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 & FORESTMANAGEMENT, PARTICULARLY FIRE PREVENTION & SUPPRESSION.

Function

INSTRUMENT FOR DETERMINING ATMOSPHERIC HUMIDITY BY COMPARING DIFFERENT READINGS FROM TWO THERMOMETERS, ONE WITH BULB KEPT WET & VENTILATED.

Technical

INVENTED BY ASSMAN IN 1890, THIS FORM OF PSYCHROMETER WOULD HAVE 2 THERMOMETERS ENCLOSED IN DOUBLE WALLED DUCT OF REFLECTIVE METAL, WITH VENTILATION EFFECTED BY CLOCK OR ELECTRICALLY DRIVEN FAN. ASSMAN PSYCHROMETERS OF MUCH SAME FORM APPEAR IN RELATIVELY MODERN CATALOGUES ETC.

Area Notes

Unknown

Details

Markings

.1 INCISED LETTERING READING "NEGRETTI & ZAMBRA. LONDON." ON ONE SIDE, "No 129" ON OTHER

Missing

2 THERMOMETERS

Finish

.1 PLATED/.2 BROWN STAINED & COATED WOOD/ WHITE SYNTHETIC

Decoration

.1 INCISED N&Z LOGO BESIDE MFR.'S NAME