General Information

Serial #

N/A

Part Number

2

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

Saegmuller

Country

United States of America

State/Province

District of Columbia

City

Washington

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

.1-.3 PENDULUMS NUMBERED '1' TO '3'- NUMBER STAMPED ON TOP OF EACH PENDULUM/

Missing

PENDULUMS ARE COMPLETE IN THEMSELVES. THEY WERE USED WITH KNIFE EDGES, AND SWUNG IN BOTH THE MENDENHALL & CANADIAN BRONZE PENDULUM APPARATUS

Finish

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

Decoration

N/A