General Information

Serial #

N/A

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

GLASS OPTICS; CAST METAL CASING. BLACK PAPER SHADE TAPED OVER ONE END OF GRATING.

Dimensions

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

Length

19.8 cm

Width

18.0 cm

Height

17.8 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

Bausch Lomb

Country

United States of America

State/Province

New York

City

Rochester

Context

Country

Canada

State/Province

Ontario

Period

THIS GRATING PROBABLY USED C. 1950S TO 1980S.

Canada

USED IN THE NATIONAL RESEARCH COUNCIL'S SPECTROSCOPY LABORATORIES, WHOSE HIGH STANDARDS AND GROUND BREAKING RESEARCH HELPED TO ESTABLISH NRC'S INTERNATIONAL REPUTATION IN THIS FIELD.

Function

USED WITH SPECTROGRAPH TO SEPARATE LIGHT INTO CHARACTERISTIC WAVELENGTHS FOR PURPOSES OF OBSERVATION AND ANALYSIS.

Technical

PRISM EFFECT ON GLASS SURFACE PRODUCED BY SERIES OF FINE GROOVES, CUT ON PRECISE ANGLES.

Area Notes

Unknown

Details

Markings

"BL" crudely incised on top of rear levelling leg adjustment knob. Each adjustment knob bears scale divided 0-20+ in single increments./ "B&L/ # 157" and "Bausch & Lomb Optical Co./ # 157 1200/mm/ 21[degrees] " incised in back surface of grating. " JS " handwritten in pencil on grating edge.

Missing

NONE, SAVE MFR'S LABEL. From CA of 04/12/2000 by Myles Bailey: No - Complete

Finish

ROUGHLY TEXTURED BRONZE COLOUR METAL CASING;BRUSHED ALUMINUM ADJUSTMENT KNOBS ON LEVELLING FEET; FLAT BLACK FINISH ON MAT OR FRAME SURROUNDING GRATING FACE./ ALUMINIZED GLASS COATING ON SIDES.

Decoration

N/A