General Information

Serial #

490

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

METAL CASING WITH SYNTHETIC ENDS/ METAL & SYNTHETIC CONTROLS & WORKING PARTS/ SYNTHETIC POWER CORD/ GLASS? METER WINDOW

Dimensions

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

Length

27.5 cm

Width

19.2 cm

Height

17.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Electronics

Sub-Category

N/A

Manufacturer

AKA

General Radio

Country

United States of America

State/Province

Massachusetts

City

Cambridge

Context

Country

Canada

State/Province

Quebec

Period

1960'S+

Canada

EQUIPMENT USED IN ENGINEERING DEPT. OF NATIONAL FILM BOARD OF CANADA. CREATED IN 1939,NFB IS PUBLIC AGENCY THAT PRODUCES & DISTRIBUTES FILMS & OTHER AUDIOVISUAL WORKS WHICH REFLECT CANADA. AT ONE TIME WELL FUNDED BY GOV'T, NFB HAD GOOD QUALITY EQUIPMENT BY WELL KNOWN MFRS.

Function

INSTRUMENT USED TO MEASURE SOUND LEVELS FROM 24 TO 14O DB BY READING, IN TERMS OF STANDARD REFERENCE LEVEL, SOUND LEVEL AT ITS MICROPHONE. IT WAS INTENDED FOR USE IN DETERMINING NOISE LEVELS OF ENGINES & MACHINERY, INVESTIGATING ACOUSTICAL PROPERTIES OF STRUCTURES & MATERIALS, & IN LABORATORY.

Technical

EXAMPLE OF ACOUSTICAL TEST EQUIPMENT OF 1960'S, PART OF EQUIPMENT OF AUDIOVISUAL PRODUCTION FACILITY.

Area Notes

Unknown

Details

Markings

INCISED WHITE LETTERING READING "SOUND-LEVEL METER/ TYPE NO. 1551-A SERIAL NO. 490 [.2 SERIAL NO. 1937]/ GENERAL RADIO CO./ CAMBRIDGE MASS., U.S.A."/ BLACK LETTERING ON METER READS "GENERAL RADIO CO./ MFD. BY WESTON/ MODEL 301 G.R. 488-301A"/ INCISED WHITE LETTERING FOR CONTROL FUNCTIONS/.1 LABEL ON COVER INTERIOR READS "TYPE 1560-P/ SERIAL 2077/ SENS -59.7/ IMPEDANCE 475 pF/ CALIBRATION TRACEABLE TO NATIONAL BUREAU OF STANDARDS/ GENERAL RADIO COMPANY/ CONCORD MASSACHUSETTS USA"; LABEL IDENTICAL ON.2 EXCEPT "TYPE 1560-P3/ SERIAL 3221/ SENS 460 pF"/.2 LABEL READING "CALIBRATED/ DATE APRIL 1971"

Missing

.2 MISSING MICROPHONE PART

Finish

TEXTURED BLACK PAINTED CASING EXTERIOR WITH BLACK END PIECES/ BLACK IMITATION LEATHER INTERIOR PANEL/ FLAT BLACK PAINTED LID INTERIOR/ BLACK CONTROLS, DIAL CASING, FEET, POWER CORD/ PLATED & METALLIC PARTS/ COLOURLESS TRANSPARENT GLASS

Decoration

MOULDED "GR" LOGO ON SYNTHETIC CASING ENDS/.1 LABEL READING "NATIONAL FILM BOARD CANADA OFFICE NATIONAL DU FILM"