General Information

Serial #

R/25402

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

27.3 cm

Width

13.3 cm

Height

33.6 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 & RECORD THE RELATIVE HUMIDITY OF THE AIR BY MEASURINGTHE 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 HAIR BUNDLE PROTECTOR RATHER THAN 2. N & Z HYGROGRAPHS WERE USED AT CANADIAN INTERNATIONAL POLAR YEAR STATIONS IN 1932-1933 & AT CANADIAN OBSERVING STATIONS IN THE 1950'S & 1960'S.

Area Notes

Unknown

Details

Markings

INTERIOR PLATE READS 'HYGROGRAPH/ MADE IN ENGLAND/ SERIAL NO. R/ 25402/ RANGE 10/100%/ REG. NO. 698680'/ EXTERIOR PLATE READS 'NEGRETTI & ZAMBRA/ TRADE MARK/ LONDON'

Missing

CASING CLASP From CA of 11/26/1993 by Tony Missio: No - Complete

Finish

BLACK ENAMEL PAINTED/ PLATED PARTS/ CLEAR, COLOURLESS GLASS/ BROWN HAIR

Decoration

N/A