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    Sale 7604

    Important Clocks and Marine Chronometers

    1 July 2008, London, King Street

  • Lot 16

    A Victorian mahogany and brass-mounted two day marine chronometer with Hartnup balance


    Price Realised  


    A Victorian mahogany and brass-mounted two day marine chronometer with Hartnup balance
    Charles Frodsham, London, No.3582. Circa 1870
    BOX: three-tier brass-bound with brass drop-down handles with unusual inset hinges, repairer's label pasted to the inside of the second section and inscribed CLEANED/ Jan 1948 by/LILLEY & REYNOLDS, LTD./9, RAILWAY PLACE,/London, E.C.3., brass bowl and gimbal; box key--190 mm. square
    DIAL: silvered Roman and Arabic dial signed CHARLES FRODSHAM/84 STRAND LONDON/No.3582, 56-hour state up/down at XII and subsidiary seconds at VI, with garter inscribed BY APPOINTMENT TO THE QUEEN at X and Gold Medals of Honour at II, blued steel hands
    MOVEMENT: with spot-finished plates joined by four ringed pillars, maintaining power to the single chain fusee, the top plate signed Chas. Frodsham & Co. London--100 mm. diameter
    ESCAPEMENT: Earnshaw-type spring detent with blued steel helical spring to Hartnup's bi-metallic balance; tipsy winding key

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    R.T. Gould, The Marine Chronometer, Its History and Development, London, 1973, p.190, fig.73.

    The balance used on this chronometer was designed in 1845 by John Hartnup, the first superintendent of the Liverpool Royal Observatory. Also known as the 'gridiron balance', it uses Z shape bi-metallic balance arms and a split balance rim set at a 45 degree angle to compensate for middle temperature error.

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