Electrique David Perret, Swiss, circa 1900, case by G. Lavanchy S.A. Neuchatel. Fine oak electric driven centre seconds, wall regulator. British patent No.157 (1901), U.S. patent October 2nd, 1900, D.R.P No. 115297, Swiss patent No. 20578, Breve-Le S.G.D.G. | Important Watches, Wristwatches and clocks

Important Watches, Wristwatches and c...

Geneva, Apr 20, 1996

LOT 555

Electrique David Perret, Swiss, circa 1900, case by G. Lavanchy S.A. Neuchatel. Fine oak electric driven centre seconds, wall regulator. British patent No.157 (1901), U.S. patent October 2nd, 1900, D.R.P No. 115297, Swiss patent No. 20578, Breve-Le S.G.D.G.

CHF 10,000 - 15,000

C. Oak with glazed door and small upper side panels, Art Nouveau style. D. Silvered with Roman numerals. Blued steel hands. M. Rectangular, brass nickel plated, "fausses cotes" decoration, with shaped back plate, cylindrical pillars, electrically wound going barrel, Graham escapement with adjustable pallets, Invar seconds beating pendulum with spring suspension. Signed on the dial and reverse of the front plate. In very good condition. Dim. 250 x 52 x 24 cm.

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Notes

Electric clocks; winding-mechanism. Relates to motors for driving a wheel by means of the armature of an electromagnet, more especially for acting upon or winding up a clock mechanism. The ratchet-wheel a is driven by a pawl b, pivoted to the armature c of an eletromagnet d, and acted on by a spring e or its equivalent. During the attraction of the armature, the spring e is compressed, so that, when the circuit of the magnet is interrupted, the spring acts to rotate the ratchetwheel. Two circuit-interrupters are employed, one conquisting of a spring f carrying a contatc screw i and having and insulating projection h engaging either directly or through a pawl with the teeth of the ratchet-wheel, and the other of a spring 1 carrying a contact screw n and having an insulating-projection m bearing agaist the pawl b. The spring f tends to close the contact i, but is is opened when the ratchet-wheel acts on the projection h; the spring 1 on the other hand tends to open the contact n, but it is closed when the pawl acts on the projection m.