General Information

Serial #

137

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

SYNTHETIC & METAL CONSTRUCTION; SOME GLASS COMPONENT PARTS

Dimensions

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

Length

34.0 cm

Width

29.5 cm

Height

34.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Geophysics

Sub-Category

N/A

Manufacturer

AKA

North American

Country

United States of America

State/Province

Texas

City

Houston

Context

Country

Canada

State/Province

Unknown

Period

THIS INSTRUMENT PROBABLY USED C.1940S-1950S.

Canada

USED BY DOMINION OBSERVATORY STAFF ENGAGED IN GRAVITY SURVEYS IN CANADA. USED TO MEASURE GRAVITY IN ORDER TO PREPARE AND UPDATE MAPS DETAILING GRAVITATIONAL FIELD OF CANADA.

Function

TO MEASURE GRAVITY

Technical

EXAMPLE OF EARLYGRAVITY METER, THE INSTRUMENT WHICH LARGELY REPLACED THE PENDULUM IN GRAVITY MEASUREMENT STUDIES BY C.1930. GRAVITY METERS ALSO USED TO PROVIDE DATA FOR STUDIES RELATED TO CRUSTAL & GEOLOGICAL STRUCTURES, GEODETIC SURVEYING AND IN MINING AND PETROLEUM FIELD SURVEYS.

Area Notes

Unknown

Details

Markings

MFR'S PLATE SCREWED TO CASING FRONT READS: 'NORTH AMERICAN GEOPHYSICAL CO./ HOUSTON, TEXAS/ GRAVITY METER AG-1-NO.137/ PATENT PENDING' INVENTORY LABEL BELOW READS: 'GR 00048/ DO NOT REMOVE THIS TAG' DYMO LABEL ON TOP PANEL READS: 'NULL POINT 17.75' 'SUMMER' 'WINTER' & 'CLAMP' CONNECTIONS LABELLED. WATCH FACE READS: 'Minerva/ WATERPROOF/ SHOCK ABSORBER/ SWISS'

Missing

MOST INTERNAL COMPONENTS MISSING From CA of 12/10/2001 by David Daley: Undetermined - unknown

Finish

CASING PAINTED OFF-WHITE; BLACK FINISH ON TOP PANEL; HANDLES & TOP & BOTTOM CASING EDGES ARE SILVER METAL. WATCHFACE IS SILVER & GREY COLOURED, WITH BRONZE-COLOURED HANDS & MARKINGS

Decoration

N/A