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Details & Cataloguing

Masterworks of Time: Adolf Lange, The Golden Era of Glashütte

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Geneva

Lépine
AN EXCEPTIONAL GOLD QUARTER REPEATING CALENDAR WATCH WITH EQUATION OF TIME INDICATION CIRCA 1830
Movement: gilded, lever escapement, jewelled to the centre, bi-metallic compensation balance, single polished steel hammer repeating on coiled gong, polished cuvette with aperture for female winding square, cuvette signed Lépine
Dial: white enamel, Roman numerals, outer minute ring with red Arabic 5-minute divisions, two sectors above for equation of time to the left and retrograde date to the right, each with red Arabic numerals, blued steel hands, the equation hand with gold sun terminal, central aperture for month, signed Lépine
Case: gold, engine-turned back with central cartouche set with rock crystal insert reverse engraved with a monogram, milled band, finely engine turned bezels, short repeating slide to the upper right case side, numbered 254 and with maker's mark EM within losenge shaped cartouche
diameter 56mm
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Provenance

Habsburg Feldman Geneva, 11 November 1987, lot 76

Catalogue Note

The equation of time indication shows the difference between apparent solar time (the time as indicated on a sun dial) and mean time (the average of solar time). Since the earth has an elliptical orbit, the difference between mean and solar time ranges from +14 minutes, 59 seconds to -16 minutes, 15 seconds. Solar time agrees with mean time on or about 15 April, 14 June, 1 September and 24 December. Devising a visual display for the equation of time is especially challenging since earth's elliptical orbit must therefore be calculated and compensated for by the watchmaker.

Masterworks of Time: Adolf Lange, The Golden Era of Glashütte

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Geneva