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Papers on chronometer improvements, 1828 - 1869

Reference Code: GBR/0180/RGO 6/593

Scope and Contents

Correspondence and papers concerning improvements and refinements to chronometers, including escapements by G.W. Linderoth, J. Gray, J.C. Bloxam, and W. Eaton; I. Hermann's escapement, with explanations and plans; C.F. Frodsham's experiments on compensator balances; E. Huntingdon's compensating pendulum; a model face of an astronomical clock; H.B. James on his invention, 'the compensator'; extracts from a report on Danish exhibits at chronometer exhibitions; correction of a clock by magnetic action; C. Frodsham on improvements in chronometer manufacture; new pendulums by R. Molyneux and W. Church; a log-watch by J.W. Tarleton; a new sidereal motor clock for the Royal Observatory; an airtight case for chronometers by J. Hammersley; L. Newin's nautical compensator; and J.C. Scotchford's lever escapement. There is considerable correspondence on J.G. Ulrich's claims for rewards as inventor of the 'double-action balance and auxiliary compensation for chronometers', with extracts from 'The Morning Herald' of 1828; a House of Commons investigation into the claim; and a copy of E.J. Dent's patent for chronometers of 1842. Other correspondents include W. Cassell, J. Barrow, G.H. Richards, J. Washington and C.P. Smyth. There are also two photographs of the workings of a watch and one of C. Frodsham's pendulums and balances.


  • Creation: 1828 - 1869


Conditions Governing Access

From the Management Group:

Unless restrictions apply, the collection is open for consultation by researchers using the Manuscripts Reading Room at Cambridge University Library. For further details on conditions governing access please contact Information about opening hours and obtaining a Cambridge University Library reader's ticket is available from the Library's website (


1 volume(s) (1 volume)

Language of Materials


Former / Other Reference


Finding aid date

2006-01-06 11:51:24+00:00

Includes index.

Repository Details

Part of the Cambridge University Library Repository

Cambridge University Library
West Road
Cambridge CB3 9DR United Kingdom