General Information

Serial #

N/A

Part Number

1

Total Parts

9

AKA

N/A

Patents

N/A

General Description

METAL CASING & PARTS/ SYNTHETIC METER CASING, CARRYING HANDLE & PARTS/ RUBBER? GASKET/ PLASTIC COVERED PAPER INSTRUCTION & CALIBRATION SHEETS TAPED TO CASING INTERIOR

Dimensions

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

Length

77.5 cm

Width

48.0 cm

Height

31.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Light & electromagnetic radiation

Sub-Category

N/A

Manufacturer

AKA

SED

Country

Canada

State/Province

Saskatchewan

City

Saskatoon

Context

Country

Worldwide

State/Province

Unknown

Period

1979 +

Canada

A second generation Brewer spectrophotometer, a travelling unit made by the Canadian manufacturer Sed Systems for the Atmospheric Environment Service. Later, these instruments [then made by Sci-Tec of Saskatoon] were used world wide. MSC is the world calibration centre for all ozone observing equipment and all measurements are referred back to the MSC facility in Toronto (ref. 1).

Function

A spectroscopic device used to photometrically measure relative intensities of spectral lines created by atmospheric ozone, used to monitor levels of ozone in the upper atmosphere. This instrument travelled throughout the world and was used to make measurements for comparison with readings from Dobson units previously used, so as to prove the new system.

Technical

The Dobson spectrophotometer, developed in 1930s, was the standard instrument until 1960s, when advances in optical design and electronics led to the development of the Brewer spectrophotometer by Alan Brewer of the University of Toronto, and David Wardle, C.T. McElroy and J.B. Kerr of the Atmospheric Environment Service. The latter instrument was a significant improvement, allowing virtually simultaneous observations of sun and sky with more lines being targeted and sequenced in few minutes (Ref. 1). From Tom McElroy forwarded Ken Devine, Sept. 9, 2009 (Ref. 4): "That is one of the two Brewers (numbers 2 and 3) that were made under contract to AES by SED systems in Saskatoon. We were very busy in the late 1970s and we arranged to have the production instrument designed and prototyped in industry. Despite of all the advice we gave them, the instruments were not satisfactory and we built the #004 in the lab ourselves. We then got SED to produce engineering drawings from the prototype and that led to the competition to build the first three production instruments - #'s 5 to 7 inclusive."

Area Notes

Unknown

Details

Markings

INDENTED BLACK LETTERING ON CONTROL PANEL INSIDE CASE READS "BREWER OZONE SPECTROPHOTOMETER/ SED SYSTEMS LTD/ SASKATOON, CANADA"/ BLUE MARKINGS & LETTERING ON METER FACE READS "INTENSITY (10 (6) Photons/Sec/ TEMP ([DEGREES] C.)/ SED SYSTEMS LTD/ SASKATOON, CANADA"/ BLACK LETTERING & LABELS FOR CONTROL FUNCTIONS/ WHITE PAPER LABEL ON CASING FRONT READS "FISHERIES/ AND ENVIRONNEMENT [SIC]/ CANADA/ ATMOSPHERIC/ ENVIRONMENT/ PECHES/ ET ENVIRONMENT [SIC]/ CANADA/ ENVIRONNEMENT/ATMOSPHERIQUE/ 4905 DUFFERIN STREET/ DOWNSVIEW, ONTARIO M3H 5T4"

Missing

APPEARS COMPLETE

Finish

CASING EXTERIOR PAINTED GLOSSY BLUE/ BRUSHED METAL & WHITE PAINTED INTERIOR PANELS WITH BLACK SYNTHETIC CONTROLS & PARTS/ WHITE METER FACE WITH COLOURLESS TRANSPARENT COVER/ METALLIC PARTS

Decoration

N/A