General Information

Serial #

N/A

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

SYNTHETIC COVERED WOOD BASE (NON-ORIGINAL REPLACEMENT FOR ORIGINAL SLATE BASE)/ BRASS & STEEL PARTS/ SYNTHETIC (BAKELITE?) PARTS/ GLASS OPTICS & MIRRORS/ GLASS THERMOMETERS ON METAL MOUNTS/ TORTOISESHELL? MIRROR BACKS/ CERAMIC DIAL.

Dimensions

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

Length

121.4 cm

Width

121.4 cm

Height

104.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric temperature measurement

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

England

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Ontario

Period

CA. 1867 TO 1930'S.

Canada

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

Function

INSTRUMENT WHICH MEASURED AIR TEMPERATURE BY MEANS OF 1 WET BULB & 1 DRY BULB THERMOMETER, & RECORDED THE RESULTS ON PHOTOGRAPHIC PAPER. IN ADDITIONTO MEASURING AMBIENT AIR TEMPERATURE, IT ALSO SERVED AS RECORDING PSYCHROMETER AS MEASUREMENTS FROM WET & DRY BULB THERMOMETERS COULD BE USED TO CALCULATE R.H.

Technical

LATER (C. 1867) FORM OF KEW PHOTOGRAPHIC THERMOGRAPH ORIGINALLY DEVELOPED IN 1840'S AFTER INVENTION OF PHOTOGRAPHY. IT CONSISTS OF 2 MERCURY THERMOMETERS WITH BULBS IN OUTDOOR SCREEN & REST OF TUBES INDOORS, WHERE SYSTEM OF LENSES MAGNIFIES & FOCUSES LIGHT OF FLAME WHICH ILLUMINATES THERMOMETER TUBES. THIS THERMOGRAPH WAS BUILT BETWEEN 1867 AND 1873. THE ROYAL SOCIETY IN LONDON PROPOSED THE BUILDING OF THREE TYPES OF RECORDING INSTRUMENT, INCLUDING THE PHOTOGRAPHIC THERMOGRAPH AND BAROGRAPH (1987.0510), 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 THERMOGRAPH AND BAROGRAPH WERE AT THE KEW OBSERVATORY IN LONDON FOR VERIFICATION (REF. 3)

Area Notes

Unknown

Details

Markings

Incised lettering on lenses reading 'THERMOGRAPH' & 'H.ANDERSON & SONS/ LONDON'/ 'THERMOGRAPH' incised on drum & clock/ clock mechanism incised 'R. MUNRO/ LONDON/ 1874'/ black calibrated thermometer mounts marked in black 'L. CASELLA/ LONDON'

Missing

COVER? From CA of 01/27/1994 by Tony Missio: Undetermined

Finish

BLACK ARBORITE/ BLACK PAINTED, LACQUERED?, & UNFINISHED BRASS & METAL PARTS/ CLEAR & MIRRORED GLASS

Decoration

BLACK LINE DESIGN ON BLACK CALIBRATED DIAL.