BREGUET ET FILS [寶璣] | A VERY RARE GOLD OVAL RING THERMOMETER NO. 2119, SOLD 1 MAY 1810 BY MOREAU OF LA MAISON RUSSIE TO COMTE POTOCKI FOR 336 FRANCS [極罕有黃金橢圓形溫度計，編號2119，1810年5月1日以336法郎售予波托茨基伯爵]
BREGUET ET FILS
A VERY RARE GOLD OVAL RING THERMOMETER
NO. 2119, SOLD 1 MAY 1810 BY MOREAU OF LA MAISON RUSSIE TO COMTE POTOCKI FOR 336 FRANCS
• Mechanism: gilded, circular bi-metallic strip operating rack and pinion system
• Dial: gold with contrasting engine turning by Tavernier - radial to the outer edges and cross hatched to the centre, slim blued steel hand indicating to a satin finished ring, the cardinal points marked Chaleur, Fievre, Glace, Tempéré, banner to the base signed Breguet et fils
• Case: gold oval, polished bezels, decoratively engraved band, glazed back, milled shank
length 29mm, width 22mm
Accompanied by a Breguet certificate dated 29 January 2020.
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Dial and case in good overall condition, thermometer not tested.
The lot is sold in the condition it is in at the time of sale. The online condition report is provided to assist you with assessing the condition of the lot and is for guidance purposes only. The images of the lot also form part of the online condition report for the lot provided by Sotheby's. Any reference to condition in the online condition report does not amount to a full description of condition. The online condition report may make reference to particular imperfections of the lot but you should note that the lot may have other faults not expressly referred to in the online condition report of the lot or shown in the online images of the lot (for example, the online condition report may not specify mechanical replacements or imperfections to the movement, case, dial, pendulum, separate base(s) or dome). Watches in water-resistant cases have been opened to examine movements but no warranties are made that the watches are currently water-resistant. The online condition report may not refer to all faults, restoration, alteration or adaptation because Sotheby's is not a professional conservator or restorer but rather the online condition report is a statement of subjective, qualified opinion genuinely held by Sotheby's (for example, information regarding colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's). Please also note that we do not guarantee the authenticity of any individual component parts, such as wheels, hands, crowns, crystals, screws, bracelets and wrist bands, since subsequent repairs and restoration work may have resulted in the replacement of original parts. In addition, certain images of the lot provided online may not accurately reflect the actual condition of the lot (for example, the online images may represent colours and shades which are different to the lot's actual colour and shades). For these reasons, the online condition report is not an alternative to taking your own professional advice regarding the condition of the lot. Prospective buyers should also refer to the Buying at Auction guide which includes important notices concerning the type of property in this sale. In particular, please note it is the purchaser's responsibility to comply with any applicable import and export matters, particularly in relation to lots incorporating materials from endangered species. Please be advised that wristbands made of materials derived from endangered or otherwise protected species (i.e. alligator and crocodile) are not sold with the watches and are for display purposes only. We reserve the right to remove these bands prior to shipping. NOTWITHSTANDING THIS ONLINE CONDITION REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS (ONLINE ONLY).
Antiquorum Geneva, The Art of Breguet, 14 April 1991, lot 43
Breguet, E. , Breguet, Paris 1997, pp. 263
The accompanying Breguet certificate notes that the present ring thermometer was sold for FF 336 by Moreau of La Maison Russie to Count Potocki to whom Moreau had been introduced by Count Ozarovsky.
Count Stanislas Kostka Potocki (1755-1821) was born in Lublin in Poland and married Princess Aleksandra Lubomirska (1760-1836), the daughter of Stanislaw Lubomirski, a Grand Marshall of the Crown, in 1776. Count Potocki held the Knighthood of the White Eagle and Saint Stanislaus Merits and was Great Master of the Polish Freemasons. He founded the University of Warsaw in 1816 and was elected President of the Senate in 1818. He devoted his fortune to promoting literature, sciences and the arts. He built up a beautiful collection of paintings, Etruscan vases and engravings in his Wilanów castle near Warsaw which he put on view to the public in a portion of the castle, making it one of Poland’s earliest museums. In addition to the present lot, Count Potocki also owned Breguet no. 1176, a four-minute tourbillon, which was purchased a year prior to this ring thermometer.
Breguet devoted considerable time to developing the thermometer. The present ring thermometer's indicating hand is attached to the arbor of a pinion which engages with two brass racks. A bi-metallic strip in the form of a double ring is connected to one of the brass racks. A rise in temperature causes the bi-metallic strip to curl inwards, with a fall in temperature the strip uncurls. This action moves the rack back and forth thereby causing the indication hand to move along the dial's scale. The second brass rack ensures that there is no backlash in the pinion teeth. A similar thermometer ring, numbered 2484, is illustrated in G. Daniels, The Art of Breguet, 1975, p.216, figs. 222a-c. For further information on Breguet's thermometers see op. cit. p.91 and E. Breguet, Breguet, p. 262.