General Information

Serial #

M/1840

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

METAL CASING, TUBE, PARTS/ BRASS KNOB, RINGS, SCALE/ GLASS THERMOMETER TUBE.

Dimensions

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

Length

N/A

Width

6.5 cm

Height

96.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric pressure 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

BRITISH MADE BAROMETER OF TYPE USED BY CANADIAN METEOROLOGICAL SERVICE FROM AT LEAST 1930'S, POSSIBLY UNTIL 1950'S. THIS KIND OF BAROMETER WAS USED AT CANADIAN INTERNATIONAL POLAR YEAR STATIONS IN 1932-1933.

Function

AN INSTRUMENT THAT MEASURES ATMOSPHERIC PRESSURE THROUGH ITS EFFECT ON A COLUMN OF MERCURY.

Technical

DEVELOPED IN ITS MODERN FORM AFTER 1850, KEW FIXED CISTERN TYPE BAROMETER MEASURES HEAD OF MERCURY DIRECTLY WITHOUT ANY ADJUSTMENT OF CISTERN LEVEL; IT HAS FLANGE IN METAL CISTERN TO DAMPEN OSCILLATIONS IN MERCURY DURING MOVEMENT & CONTRACTED SCALE TO COMPENSATE FOR FIXED CISTERN. THIS BAROMETER IS LESS TRANSPORTABLE BUT LESS COMPLEX TO USE THAN ADJUSTABLE CISTERN TYPE.

Area Notes

Unknown

Details

Markings

Black lettering on scale reading 'NEGRETTI & ZAMBRA/LONDON', 'M/1840' & 'MADE FOR/INSTRUMENTS LTD./OTTAWA & TORONTO/BRITISH MAKE'/black markings on scale for 88 to 111 & 26 to 32/brass plate with black lettering reading 'M/1840/STANDARD/TEMPERATURE/AT 1000 MB'/thermometer marked in black for 260 to 820 absolute & 10 to 130 F. & 'Y4642'.

Missing

From CA of 04/27/2004 by Sue Warren: Yes - missing mercury

Finish

BLACK ENAMEL PAINTED/ BRASS COLOURED AND METALLIC PARTS/ CLEAR, COLOURLESS GLASS.

Decoration

MFR'S LOGO ON SCALE AND THERMOMETER.