General Information

Serial #

N/A

Part Number

1

Total Parts

7

AKA

N/A

Patents

N/A

General Description

SLATE BASE/ METAL PARTS (BRASS WITH SOME GOLD?)/ GLASS LENSES & BAROMETER TUBE/ CERAMIC DIAL

Dimensions

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

Length

190.0 cm

Width

35.9 cm

Height

162.0 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

Unknown

Country

England

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

C. 1887 UP TO 1940

Canada

INSTRUMENT USED TO RECORD ATMOSPHERIC PRESSURE AT CANADA'S FIRST METEOROLOGICAL OBSERVATORY, PROVIDING A CONTINUOUS PHOTOGRAPHIC RECORD OF PRESSURE CHANGES FOR RESEARCH PURPOSES RATHER THAN WEATHER PREDICTION.

Function

INSTRUMENT WHICH MEASURED ATMOSPHERIC PRESSURE BY MEANS OF A MERCURY BAROMETER & RECORDED THE RESULTS ON PHOTOGRAPHIC PAPER.

Technical

LATER (C. 1867) FORM OF KEW TYPE PHOTOGRAPHIC BAROGRAPH,ORIGINALLY DEVELOPED IN 1840'S AFTER INVENTION OF PHOTOGRAPHY. IT CONSISTS OF MERCURY TUBE MOUNTED VERTICALLY ON TABLE, & SEVERAL LENSES TO MAGNIFY & FOCUS LIGHT OF FLAME WHICH ILLUMINATES TUBE & CREATES IMAGE ON LIGHT SENSITIVE PAPER ON CLOCK CONTROLLED DRUM. THIS BAROGRAPH WAS BUILT BETWEEN 1867 AND 1873. THE ROYAL SOCIETY IN LONDON PROPOSED THE BUILDING OF THREE TYPES OF RECORDING INSTRUMENT, INCLUDING THE PHOTOGRAPHIC BAROGRAPH AND THERMOGRAPH (1987.0509), FOR BRITISH OBSERVATORIES IN 1867 AND BY LATER THAT YEAR EXAMPLES OF THESE INSTRUMENTS WERE OPERATING AT KEW AND OTHER OBSERVATORIES (REFS. 1-2). IN 1873, THE CANADIAN BAROGRAPH AND THERMOGRAPH WERE AT THE KEW OBSERVATORY IN LONDON FOR VERIFICATION (REF. 3).

Area Notes

Unknown

Details

Markings

Incised lettering on drum reading 'BAROGRAPH'/ incised lettering on lens reading 'BAROGRAPH/ H. ANDERSON & SONS/ LONDON'/ clock mechanism incised 'R. MUNRO'

Missing

From CA of 10/26/1993 by Tony Missio: Undetermined

Finish

BLACK BASE/ LACQUERED? & BLACK PAINTED BRASS & METAL PARTS/ COLOURLESS TRANSPARENT & TRANSLUCENT GLASS/ WHITE CERAMIC/ BROWN STAINED & VARNISHED WOOD

Decoration

BLACK LINE DESIGN ON CALIBRATED DIAL