General Information

Serial #

7318

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

metal casing, base, stand, controls, parts/ glass optics/ synthetic label cover/ paper label

Dimensions

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

Length

26.5 cm

Width

13.1 cm

Height

33.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Sunshine intensity & duration measurement

Sub-Category

N/A

Manufacturer

AKA

Gunther Tegetmeyer

Country

Germany

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

This instrument was apparently in use for 50 years (Ref. 4).

Canada

A radiation measuring instrument of a type used by the Meteorological Service of Canada to gather radiation data, at a solar radiation research site. Part of a large collection of meteorological instruments acquired from the Meteorological Service of Canada (previously Atmospheric Environment Service) 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).

Function

An instrument used to measure the radiation from the direct beam of the sun; direct beam RF8 (Radiation Field 8) measurements are made at solar radiation research sites.

Technical

A German-made bimetal actinometer. This microscope like instrument was used to measure the radiation from the direct beam of the sun. Direct beam (RF8) measurements of the sun which have a 5° degree beam width are made at research sites only. Presently a tracking pyrheliometer is used for this measurement (Ref. 1). The Department of Transport, Meteorological Branch label indicates that this instrument was made before 1971 when that dept. became EC AES. From the English precis of the German instructions entitled ‘Bimetal Actinometer according to Buttner': ‘The bimetal actinometer is principally used for measuring the radiation of the sun, the rays being conducted through a light tunnel onto the lamella. The deformation of this lamella is ascertained through a microscope from a tracer thread. The advantage of the Buttner type actinometer consists in the arrangement of plates of the same characteristics and connected in opposition, thus eliminating the disturbing effect of the temperature of the instrument (migration of the zero point, the lamella acting as a thermometer). The compensated system of lamellas is embodied in a metal housing including a thermometer to be read from the outside. A metal case surrounds the internal element and carries on the top plate the light tunnel, a filter case with 7 adjustable filters and the hinged cover as well as the lighting aperture for the microscope with device for interposing a a coloured glass and a finder. After the image of the sun has been adjusted by the finder, the microscope will show a small projection of the sun image which while the tracer thread is directed upon the mark of the ground glass plate of the field of view in the microscope, ensures the sighting of the sun and thus the constant direction of the rays of the sun into the instrument during measurement.' (Ref. 2)

Area Notes

Unknown

Details

Markings

plates on front and side reads 'Gunther & Tegetmeyer/ BRAUNSCHWEIG No. 7318'/ label on side reads 'CANADA/ DEPARTMENT OF TRANSPORT/ METEOROLOGICAL/ BRANCH'/ typed paper label reads '1 Quarzglas 3 RG 2/ 2 O G 1 4 RG 8/ 5 - 8 frei'/white AES label with black lettering reading '6650-0008 7318 [bar code]/ *5257-00410* ARQX/ MICROSCOPE, GUNTHER'

Missing

unknown

Finish

white instrument casing & stand parts/ brushed & black painted parts/ colourless transparent glass/ black crinkle finished base/ glossy black painted post/ white synthetic/ white? paper with colourless transparent cover

Decoration

N/A