Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

3

Ou

S/O

Brevets

S/O

Description générale

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

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

121,4 cm

Largeur

121,4 cm

Hauteur

104,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Météorologie

Catégorie

Mesure de température de l'atmosphère

Sous-catégorie

S/O

Fabricant

Ou

Inconnu

Pays

England

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Ontario

Période

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.

Fonction

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.

Technique

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)

Notes sur la région

Inconnu

Détails

Marques

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'

Manque

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

Fini

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

Décoration

BLACK LINE DESIGN ON BLACK CALIBRATED DIAL.