Mendenhall apparatus
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1987.2133.001
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- OBJECT TYPE
- RELATIVE/NON-REVERSIBLE/INVARIABL
- DATE
- 1901–1902
- ARTIFACT NUMBER
- 1987.2133.001
- MANUFACTURER
- Saegmuller, George N.
- MODEL
- 1/2-SECONDS
- LOCATION
- Washington, District of Columbia, United States of America
More Information
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
CITE THIS OBJECT
If you choose to share our information about this collection object, please cite:
Saegmuller, George N., Mendenhall apparatus, between 1901–1902, Artifact no. 1987.2133, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1987.2133.001/
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