General Information

Serial #

4529

Part Number

1

Total Parts

10

AKA

N/A

Patents

N/A

General Description

METAL PSYCHROMETER CASING WITH SYNTHETIC PARTS/ GLASS THERMOMETERS CONTAINING SPIRIT

Dimensions

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

Length

46.5 cm

Width

8.8 cm

Height

N/A

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

Casella

Country

England

State/Province

Unknown

City

London

Context

Country

Unknown

State/Province

Unknown

Period

Unknown

Canada

*[RICHARD ASSMAN METEOROLOGISTWAS METEOROLOGIST WORKING IN BERLIN CIRCA 1900. HE ALSO CONFIRMED EXISTENCE OF STRATOSPHERE IN 1902, SAME YEAR THAT IT WAS ANNOUNCED BY TEISSERENC DE BORT.]

Function

AN INSTRUMENT USED ABOARD SHIP FOR SPOT READINGS OF ATMOSPHERIC HUMIDITY, WHEREIN THE DIFFERENT READINGS FROM TWO THERMOMETERS, ONE WITH A BULB KEPT WET AND VENTILATED, ARE COMPARED.

Technical

INVENTED BY ASSMAN IN 1890, THIS FORM OF PSYCHROMETER HAS 2 THERMOMETERS ENCLOSED IN A DOUBLE WALLED DUCT OF REFLECTIVE METAL, WITH VENTILATION EFFECTED BY A CLOCK OR BATTERY DRIVEN FAN. ASSMAN PSYCHROMETERS OF MUCH THE SAME FORM APPEAR IN RELATIVELY MODERN CATALOGUES.*

Area Notes

Unknown

Details

Markings

Plates on psychrometer reading 'CASELLA/ LONDON' & '4529/ MADE IN ENGLAND'/ gold lettering on thermometer backs reads 'Wilhelm Lambrecht KG, Gottingen'/black thermometer scales & lettering reading '842/72' & '816/72'/ decal inside case reads 'CARLETON/ INSTRUMENTS/ LTD./ 2414 HOLLY LANE/ OTTAWA ONT./ MODEL/ ASSMAN/ HYGROMETER/ SERIAL NO/ MODEL T 8904/1/4529/ CARL 3391/17-12-70'.

Missing

From CA of 12/07/1993 by Tony Missio: No - Complete

Finish

PLATED METAL/ BLACK AND WHITE SYNTHETIC/ CLEAR, COLOURLESS GLASS/ WOOD STAINED AND VARNISHED/ GREEN FELT/ BROWN LEATHER/ BLUE CARDBOARD.

Decoration

CROSSHATCHING ON MOTOR WIND KEY.