General Information

Serial #

9001

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

metal mechanism, base, stand, parts/ synthetic cap knobs, cord covering

Dimensions

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

Length

21.5 cm

Width

18.0 cm

Height

N/A

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

EPLAB

Country

United States of America

State/Province

Rhode Island

City

Newport

Context

Country

Canada

State/Province

Unknown

Period

This instrument was apparently in use for 36 years (Ref. 7).

Canada

A radiation measuring instrument of a type used by the Meteorological Service of Canada to gather radiation data. 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

The Angstrom pyrheliometer was one of the best known and reliable instruments available for measuring solar intensity and was often used as a secondary standard. The sensor consists of two strips of blackened platinum located at the rear of the main tube; a shutter at the front of the tube enables either one or the other of the strips to be shaded from the sun. The shaded strip is automatically connected to a heating circuit and heated electrically until it is the same temperature as the exposed strip. The rate at which electrical energy is used to heat the shaded strip must equal the rate at which solar energy heads the exposed strip and is used to calculate the solar intensity (Refs. 2-6).

Area Notes

Unknown

Details

Markings

silver lettering on green plate reading 'EPPLEY PYRHELIOMETER/ TYPE NORMAL INCIDENCE/ MODEL ANGSTROM NO. 9001/ THIS RADIOMETER HAS BEEN COMPARED WITH THE EPPLEY GROUP/ OF REFERENCE STANDARDS. THE DERIVED VALUE OF THE CONSTANT/ (K) IS:/ 6.29 WHEN I IS EXPRESSED IN CAL. CM. -2 MIN.-1/ AND i IN AMPS. (SEE CERTIFICATE)/ THE EPPLEY LABORATORY, INC./ NEWPORT, R.I./ MADE IN U.S.A.'/ incised lettering on connector reads "AMPHENOL 165-33'

Missing

unknown

Finish

plated and brushed metal/ green crinkle finished base/ black knobs, cap/ white cord/ grey connector

Decoration

N/A