General Information

Serial #

R/25390

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

CAST IRON BASE/ METAL CASING WITH GLASS WINDOW/ METAL PARTS/ HUMAN HAIR

Dimensions

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

Length

27.0 cm

Width

13.5 cm

Height

33.7 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

Negretti Zambra

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Unknown

Period

Unknown

Canada

A BRITISH MADE HYGROGRAPH OF A TYPE USED BY THE CANADIAN METEOROLOGICAL SERVICE.

Function

USED TO MEASURE AND RECORD THE RELATIVE HUMIDITY OF THE AIR BY MEASURING THE CHANGE IN THE LENGTH OF A BUNDLE OF HUMAN HAIR AS IT ABSORBS WATER VAPOUR.

Technical

NEGRETTI & ZAMBRA'S 1938 CATALOGUE & MIDDLETON'S 1941 BOOK ILLUSTRATE A N & Z HYGROGRAPH VERY SIMILAR TO THIS ONE, EXCEPT WITH 4 OPENINGS IN THE HAIRBUNDLE PROTECTOR TUBE RATHER THAN 2. N & Z HYGROGRAPHS WERE USED AT CANADIAN INTERNATIONAL POLAR YEAR STATIONS IN 1932-1933 & IN CANADIAN OBSERVING STATIONS IN THE 1950'S & 1960'S.

Area Notes

Unknown

Details

Markings

Interior plate reading 'HYGROGRAPH/MADE IN ENGLAND/SERIAL NO.R/25390/RANGE 10/100%/REG. NO. 698680'/exterior plate reading 'NEGRETTI & ZAMBRA/TRADE-MARK/LONDON'/exterior decal reading 'ENVIRONMENT CANADA/ATMOSPHERIC/SERVICE/ 25390 106/CLOUD PHYSICS RESEARCH DIVISION'.

Missing

N/A

Finish

BLACK ENAMEL PAINTED CASING/ METALLIC PARTS/ PLATED HANDLE.

Decoration

N/A