L\'ART DE L\'HORLOGERIE EN FRANCE DE ...

Geneva, Hotel Des Bergues, Nov 14, 1993

LOT 122

P. B. Lepaute à Paris an III, made in 1794. Fine and extremely rare eight-day going decimal and duodecimal travelling clock, striking the panels decimal time, identical to that made for the Concours sur les moyens d'organiser les Montres & les Pendules en divisions décimales, organised by the Convention Nationale, by the Décret voted on 21 Pluviôse, second year of the Republic.

CHF 100,000 - 120,000

Sold: CHF 138,000

C. Gilt bronze rectangular with glazed side and back door, surmounted by a gallery concealing the folding handle. D. White enamel with Arabic numerals for the decimal time, outer decimal minute ring, the Roman duodecimal hour ring on the border of the bezel, divided into twice twelve hours (chipped on the edge of the winding holes). Gilt brass Breguet decimal hands, star hand for the regular time. M. Brass three train rectangular with going barrels, the going train with anchor escapement, short pendulum with knife edge suspension, with lock for transport. Striking the decimal hours and the decimal ten minutes on two bells with independent trains, the two count-wheels on the back plate control the decimal strike mechanism as follow: 1 single stroke at 10 minutes 1 double stroke at 20 minutes 1 double stroke and 1 single stroke at 30 minutes 2 double strokes at 40 minutes 2 double strokes and 1 single stroke at 50 minutes plus the repetition of the previous hour. 3 double strokes at 60 minutes 3 double strokes and 1 single stroke at 70 minutes 4 double strokes at 80 minutes 4 double strokes and 1 single stroke at 90 minutes 5 double strokes plus the hours. Signed on the dial and back plate. h1 very good condition. Dim. 22 x 15 x 10 cm.


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Notes

An identical decimal striking clock is described in the "Report on questions relating to the nei' time system, made by the jury named by the Decree of the National Convention (...) to judge the items in the contest". In their summary the judges include the memorandum recorded under No. 84 of the contest: "This report contrains the description and the plan of the dock movement with fhrec genr trains, to mark the dccin al /murs and minutes and to strike thc hours and the tend' of the hours, using one wheel less for each Bear train. The hour was made to repent nt the half hour due to the great length of the decimal hour" This description, presented in the year II, corresponds to the clock which Pierre-Basile Lepaute made in the year III, but he would not have been clearly impressed by the judges remarks: "We cannot npproae the lartout of tlrcgenr-train in this plan either: this is designed to undercut, t h rough a unisconceiocd attempt at econour y, the large third zolreel in its fluet' 'car-trains, with the idea of making Hies(' machines sirnpler: the resutlt of eliminating thesc is that the three barrels bave a large nunrber of teeth and rnesh with pinions with 8 teeth with n very small dinureter, and as a result lape teeth winch are too wenk to support Nevertheless, the judges recognised that P.B. Lepaute's work was interesting: "We considcr these strike system ta be best suitc'd to repincing the obi hour and quarter one, to subdiz'ide the length of the decimal hour into shorter intervals so that they can be clearhi distinguished. A similar clock, also signed P.B. Lepaute, is preserved at the Musée National des Techniques (C.N.A.M.), Paris. To date, three docks only striking the Decimal time are known. This clock was exhibited in the Musée International d'Horlogerie de La Chaux-de-fonds in 1989 for the exhibition: "La Réeolution dans la Mesure du Temps" and described and illustrated in the excellent catalogue; we acknowledge the assistance provided by said catalogue in the preparation of this description.