General Information

Serial #

M/1850

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

Quebec

Period

1932-1933 INTERNATIONAL POLAR YEAR.

Canada

INSTRUMENT USED AT ONE OF CANADA'S FOUR INTERNATIONAL POLAR YEAR STATIONS IN 1932-1933. OBJECT WAS TO ESTABLISH NUMEROUS POLAR STATIONS WHERE INTENSIVE OBSERVATIONS OF METEOROLOGICAL, MAGNETIC, AURORAL, & ALLIED PROBLEMS COULD BE UNDERTAKEN FROM AUG. 1 1932 TO AUG. 31 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.

Area Notes

Unknown

Details

Markings

Black lettering on scale reading 'NEGRETTI & ZAMBRA/LONDON', 'M/1850', & '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/1850/STANDARD/TEMPERATURE AT 1000 MB/thermometer marked in black for 260 to 320 absolute & 10 to 130 F. and 'Y4656'.

Missing

From CA of 11/02/1993 by Tony Missio: No - Complete

Finish

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

Decoration

MFR'S LOGO ON SCALE AND THERMOMETER.