Accession No

2647

Brief Description

geophysical pendulum apparatus or gravimeter, by Cambridge Instrument Company Ltd., English, 1926

Origin

England; Cambridge

Maker

Cambridge Instrument Company Ltd.

Class

earth sciences

Earliest Date

1926

Latest Date

1926

Inscription Date

Material

metal (alloy); glass; stone (agate); wood

Dimensions

box 1 length 358mm; breadth 275mm; height 115mm; box 2 length 290mm; breadth 249mm; height 125mm; object height 420mm; length 380mm; breadth 310mm box for prism unit length 138mm; breadth 99mm; height 128mm bubble level length 102mm; diameter 14mm second bubble level length 106mm; breadth 25mm; height 121mm pendulums are 250mm long

Special Collection

Provenance

Transferred from Department of Geophysics, University of Cambridge, Cambridge, England, 06/1980. Cambridge University, 1926. Subsequent history outlined in Jackson.JE.

Inscription

‘CAMBRIDGE
INSTRUMENT CO. LTD, ENGLAND’
‘C 128760’

Description Notes

Pendulum apparatus for investigating variations in gravity. Black-painted, metal alloy box. Lid with glazed aperture and 2 handles lifts off to reveal chamber (2 compartments) and agate bearings for 2 pendulums. Screw and lever for raising and lowering pendulums onto bearings. Linked levers for starting and stopping pendulums. One tap for pumping out air ( a second one is plugged). Removable manometer which, when in place, can be seen through a glazed aperture. Two lenses on top used for photographic recording of swings. Prism unit for same. Two levels, one with hanging weight. Two sets of 3 invar pendulums in fitted wooden boxes. Two copies of photographic traces and one pro-forma calculation dated 1963 (in file).

References

Events