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Auctioneers Dr. Crott 90th Auction

426 A. Kaiser, s-Hage (The Hague), The Netherlands, No. 8, Height 1000 mm, circa 1846 A rare Dutch precision regulator with 2/3 seconds compensation pendulum Case: oak wood, mahogany veneer, moulded, glazed on three sides. Dial: silvered, inlaid radial Roman numerals, inlaid beat indicator at “12” (0-40), blued Breguet hands. Movm.: rectangular-shaped brass movement, moulded movement pillars, Graham escapement with long lever, weight winding via pulleys, compensation pendulum. Alexander Kaiser‘s 2/3-seconds compensation pendulum This clock has an unusual 2/3-seconds compensation pendulum with spring suspension that is based on a design by Kaiser. The steel rod is guided through the moving bob and its end is fitted in a longer zinc tube held by the pendulum nut. Above the zinc tube is a brass tube on which the bob rests. The bob and the two tubes can move over the steel rod. When the temperature rises the steel rod expands and so do the zinc and the brass tube, but in the opposite direction. The result is that the centre of the mass remains where it is and compensation is achieved. The rod has a millimetre scale above the bob, where a moving weight (a so-called “Huygensscher Laeufer”) is used for fine regulation and fixed with a clamp bolt. The crutch has micrometre adjustment. Alexander Kaiser (1814-1895) It was Alexander Kaiser who devised the plan of having the same time throughout the Netherlands by means of a system that relied on so-called “tijdbewaarders”. Instead of expensive astronomical clocks, which cost about 600 guilders at the time Kaiser mass-produced these regulator clocks with a high quality movement and a temperature compensated pendulum; his clocks were almost as precise as the astronomical clocks, at a price, however, of only 60 or 70 guilders. Kaiser called them “tijdbewaarders”. For his important role in synchronizing time Alexander Kaiser was honoured with at medal during an international fair in 1873. The significance of his “tijdbe- waarders” came to an end and only very rarely does one of them appear in a private collecten. They are exquisite creation with a wonderful history. Kindly supported by Juergen Ermert. The complete description of this rare type of clock will soon be published in his book “Präzisionspendeluhren Teil 1”. Please direct your orders to “www.ppu-buch.de”. A. Kaiser, s-Hage (Den Haag) 荷蘭 — 罕見的荷蘭精密壁 鐘,附2/3秒平衡補償鐘擺 39411 C: 2 D: 2 M: 2, 41, 51 18.000 - 23.000 EUR 22.500 - 28.800 USD 180.000 - 230.000 HKD

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