General Information

Serial #

N/A

Part Number

4

Total Parts

6

AKA

N/A

Patents

N/A

General Description

BRONZE PENDULUMS, GILDED AND FITTED WITH AGATE FLATS AND ALUMINIZED GLASS MIRRORS

Dimensions

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

Length

32.0 cm

Width

9.0 cm

Height

6.2 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Geophysics

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Worldwide

State/Province

Unknown

Period

THIS TYPE OF PENDULUM IN USE SINCE C.1890.THESE PENDULUMS USED BY GSC UNTIL MID 1970S

Canada

PENDULUMS.1-.3 WERE OBTAINED C.1902 BY THE DOMINION OBSERVATORY, FOR USE WITH THE MENDENHALL APPARATUS ORDER & USED BY DR. OTTO KLOTZ (SEE 872133). THIS INSTRUMENT WAS USED TO MAKE THE FIRST GRAVITY MEASUREMENTS IN CANADA. PENDULUMS.1-.6 WERE USED WITH VARIOUS FORMS OF THE CANADIAN PENDULUM APPARATUS UNTIL MID-1970S.

Function

USED TO OBTAIN RELATIVE GRAVITY MEASUREMENTS

Technical

PENDULUMS HAVE BEEN USED FOR RELATIVE GRAVITY MEASUREMENTS SINCE THE EARLY 19TH C. SPRING-TYPE GRAVIMETERS LARGELY REPLACED PENDULUMS FOR GEOPHYSICAL SURVEYS BY C.1950: PENDULUMS CONTINUED TO BE USED FOR LONG RANGE GRAVITY TIES, WHERE THE LARGE CHANGE IN GRAVITY COULD NOT BE RELIABLY MEASURED BY SPRING-TYPE GRAVIMETERS.

Area Notes

Unknown

Details

Markings

.4-.6 ALL STAMPED 'U.S.C.&G.S.'/ '1892' & 'MADE IN U.S.A.'; EACH NUMBERED 'A-4', 'A-5', & 'A-6' RESPECTIVELY

Missing

N/A

Finish

PENDULUMS ARE GILDED TO PRODUCE OVERALL BRIGHT GOLD FINISH. EACH FITTED WITH TWO BRIGHT ALUMINIZED GLASS MIRRORS & OPAQUE AGATE FLATS

Decoration

N/A