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    Default June. Perpetual movement clock. Jean and David Geiser.

    Jean and David Geiser,
    La Chaux-de-Fonds

    Perpetual movement clock
    Marble, brass, steel, enamel
    Height: 61 cm. Width: 41 cm. Depth: 26.5 cm.


    1815


    The illusion of perpetual motion is created by the movement of the twenty-four small brass weights on the rim of the large wheel, which makes one revolution a day. In reality, the clock is driven by a spring concealed in the wheel's hub.

    The clock movement, which is at the front, has a lever escapement with a balance and spring. The white enamel dial bears the inscription Et pourtant elle tourne (Nevertheless, it moves). A gear-train at the back, designed to regulate the movement of the large wheel, terminates with a shaft consisting of three conical runners resting on a polished mirror.

    Neuchtel clockmakers in the late 18th and early 19th centuries carried out a lot of research into the principal of perpetual motion. Samuel Roy, Phine Perret and especially Jean-David Maillardet made clocks for both the general public and scientists that appeared, at first, to have solved the problem. Jean and David Geiser, a father and son team of clockmakers at Les Eplatures near La Chaux-de-Fonds, made the clock illustrated here in 1815.

    History:
    1991 (purchased).

    Bibliography:
    Chapuis, 1931, pp. 237-240
    Tardy, 1974, p. 492, illus.
    Roberts, 1989, p. 115, illus.
    Ineichen sale, Zurich, 1990, n 189, illus.
    Antiquorum sale, Genve, 1984, n 95, illus.
    Cardinal, 1993, p. 16, illus.
    Chronomtrophilia, 1993, n 35, pp. 12-26, illus.
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