General Information

Serial #

N/A

Part Number

1

Total Parts

6

AKA

N/A

Patents

N/A

General Description

.1 &.1PT LID ARE CAST BRASS;.1 HAS GLASS VIEWING WINDOWS/.2 BRASS STAND & FITTINGS; METAL BOX;.3 BRASS & SYNTHETIC CONSTRUCTION; GLASS OPTICS;.4 TEST PENDULUM MADE FROM ALLOY OF 10% ALUMINUM & 90% COPPER; FITTED WITH AGATE KNIFE EDGE/.5 PROBABLY AS FOR.4; ALSO GLASS TUBE LEVEL IN BRASS CASING/.6 WOOD HANDLE & BRASS

Dimensions

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

Length

57.5 cm

Width

44.0 cm

Height

55.3 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

Canada

State/Province

Unknown

Period

THIS INSTRUMENT USED BETWEEN 1902-C.1948 (WITH930234)

Canada

BUILT SPECIFICALLY FOR USE OF DOMINION OBSERVATORY STAFF, PRINCIPALLY DR. OTTO KLOTZ, MR. F.A. MCDIARMID & MR. A.H. MILLER. IT WAS BUILT UNDER THE SUPERVISION OF THE U.S. COAST & GEODETIC SURVEY, AND IS MODELLED AFTER THE 1/2-SECOND PENDULUM APPARATUS USED IN WASHINGTON SINCE 1891. IT WAS USED IN CANADA C.1902-C.1948

Function

TO DETERMINE THE MEASUREMENT OF GRAVITY

Technical

DEV'D X.1889-1890 BY T.C. MENDENHALL & U.S. COAST & GEODETIC SURVEY, WASHINGTON DC. MENDENHALL PENDULUM APPARATUS IS A 1/2-SECOND PENDULUM APPARATUS, PROVIDING RELATIVE VALUES FOR GRAVITY. CONSIDERED PORTABLE, ACCURATE, MORE RAPID & CONVIENENT THAN OLDER PENDULUM PIER-TYPE METHODS, THE MENDENHALL & SIMILAR PENDULUM-TYPE INSTRUMENTS REPLACED AS STANDARD BY GRAVIMETERS IN 1940S.

Area Notes

Unknown

Details

Markings

.1 MFR'S PLATE SCREWED TO.1 READS: 'Geo. N. Saegmuller/ Washington, D.C.'. TUBE LEVEL MOUNTED ABOVE WINDOW & VACUUM PUMP VALVE IS GRADUATED BUT NOT LABELLED/.1PT CASE: 'PROPERTY OF/ DOMINION OBSERVATORY/ OTTAWA' STENCILLED IN GREEN ON 2 SIDES & LID OF CASE; '14' HANDPAINTED IN OFF-WHITE ON CRATE LID. 'Reading arc' HANDWRITTEN IN PENCIL IN ONE CORNER INSIDE CASE/.2 FLASH APPARATUS STAMPED ON ONE END PANEL: 'FAUTH & Co. WASHn D.C./ 2220'. CRUDE DIRECTIONAL ARROWS HANDPAINTED IN GOLDTONE PAINT ON EACH OF 3 LEGS OF BASE/.2PT CASE: '20' HANDPAINTED IN WHITE ON CASE TOP. MAILING LABEL ON CASE SIDE REPRODUCED IN SUPP.INFO.

Missing

2 AGATE KNIFE EDGE FITTINGS, SET IN SOLID METAL PLATES, ON WHICH PENDULUMS HANG IN .1; PORTABLE AIR PUMP FOR .1; 3 FOOT PLATES FOR .1; TELESCOPES FOR .1-.2; OIL LAMP FOR .2; THERMOMETER FOR .4; MISC. MINOR PTS. From CA of 12/06/2001 by David Daley: No - Complete

Finish

MOST PIECES PAINTED BLACK WITHBRIGHT LACQUERED FITTINGS. GLASS WINDOWS & LENS ON.3..4 DUMMY PENDULUM IS GOLD-PLATED; HOUSED WITHIN CLEAR PLEXIGLASS CASE. WOODEN CASE FOR.1 STAINED RED-BROWN ON EXTERIOR;.2-.3 CASE IS VARNISHED

Decoration

N/A