Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

Glass with metallic coating

Dimensions

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

Longueur

2,6 cm

Largeur

2,5 cm

Hauteur

S/O

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Météorologie

Catégorie

Mesure de pression, température et humidité de la haute atmosphère

Sous-catégorie

S/O

Fabricant

Ou

Environment CA

Pays

Canada

État/province

Inconnu

Ville

Inconnu

Contexte

Pays

Canada

État/province

Inconnu

Période

possibly 1930s+

Canada

An example of part of the technology used in Dines meteorographs, which were were used from 1911 to 1937 by the Meteorological Service of Canada (MSC) to obtain the first detailed temperature profiles of the troposphere in Canada. The first Canadian meteorograph launch occurred on February 3, 1911 by John Patterson of the MSC from close to 315 Bloor Street, Toronto. Throughout the three decades that they were used, Dine meteorographs used were sent up from Woodstock, Ont., Kingston, Ont., Goderich, Ont., Calgary, Al., and Fort Rae, NWT. A piece of meteorological equipment from a large collection of meteorological instruments used by the Meteorological Service of Canada (previously Atmospheric Environment Service) and acquired by the CSTM since 1967. MSC is the government agency responsible for collecting and disseminating meteorological data and forecasts in Canada. It was founded in 1871 in Toronto where it is still headquartered. The MSC was originally on the University of Toronto downtown campus but moved to Downsview in 1971 on land owned by UofT. The headquarters houses laboratories, research facilities and calibration and instrument maintenance facilities (now largely contracted out).

Fonction

The medium upon which readings (temperature versus pressure of the troposphere) taken by a Dines meteorograph were recorded. A meteorograph is an instrument which is lifted into the upper atmosphere by balloon to measure and record meteorological measurements such as temperature, humidity, air pressure or wind velocity.

Technique

Dines meteorographs were released on hydrogen-filled balloons. Unlike contemporary radiosondes, data was not transmitted back through radio to the MSC. Rather, data could only be collected from the meteorographs were found and returned. To encourage their return, the MSC affixed plates offering a reward and return instructions to the device. Dines meteorograph "recorded temperature versus pressure on a 1" slivered copper or glass slide. An aneroid moved the slide horizontally to record pressure while a scribe attached to the temperature sensor marked the slide vertically. The temperature sensor consisted of a nickel silver strip [that] moved the scribe to an invar rod, which has a low coefficient of expansion. The result was a curve of pressure versus temperature as the balloon ascended. Later unit incorporated a hair humidity element attached to a separate scribe. Before each flight the meteorograph was calibrated in a gasoline-filled chamber. This calibration produced a series of four isothermal lines with ticks at fixed pressure values directly on the slide. The instrument was mounted on a wire frame surrounded by a thin aluminum cylinder 16cm b 7 cm in diameter that acted as a radiation shield. The entire assembly weighed only 60 grams, a reduction from Dines 1906 prototype that had weighed 90 grams. By comparison, the Vaisala RS92 radiosonde with battery and transmitter presently used in Canada weighs 250 grams." The First Tropospheric Temperature Profile in Canada. K.A. Devine, Aurora, ON and G.S. Strong, Ardrossan, AB. Winds could also be determined from the meteorographs through visual observation, when the balloons were visible. Dines meteorographs were developed by W. H. Dines in the U.K. with the encouragement of Napier Shaw, the Director of the British Meteorological Office. The Dines was an improvement on earlier meteorographs because it did not include a clock. Clocks were not accurate at low temperatures and increased the weight of the device.

Notes sur la région

Inconnu

Détails

Marques

largely illegible writing on one side appears to read '106/ Mc?1926'

Manque

Complete

Fini

colourless transparent glass with metallic coating

Décoration

S/O