84. Auktion - Auktionen Dr. Crott

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84. Auktion - Auktionen Dr. Crott

An astronomical precision seconds pendulum clock of museumquality - only three clocks of this type were ever built by Riefler;it was designed with the intention to determine the maximumprecision that could be achieved by a seconds pendulum clock. Thisclock never came on the market; it was used as a test instrument inthe Riefler company laboratories.Case: painted air-tight metal cylinder, glass dome, cast iron suspensionwith adjusting screws. Movm.: pendulum rack with agate pads, InvarSchuler pendulum with steel blades, microscope for amplitude reading.Extras: lamp changer, control unit and amplitude recorder.The Schuler clockProf.Dr. Max Schuler in Göttingen contacted the Riefler company in1930 about his newly invented free-swinging pendulum. This was a timewhen scientists were clamoring for even more precision in timekeeping sothat temporal variations in Earth’s gravity field, effects of the continentaldrift and variations in Earth’s rotation could be determined by comparinguniversal time with solar time.General opinion at the time was that the required precision could onlybe achieved by using a free-swinging pendulum without train - this wasthe reason Riefler decided to take over Schuler’s patent No. 561 269 for a“pendulum for measuring time”.During the first tests with a free-swinging pendulum the pendulum wassynchronized with a Riefler clock. In the following years the team aroundSchuler worked on finding a driving mechanism which would make thependulum self-propelling and independent of any external drive device.Around 1937 the scientists at Riefler were finally able to create a Schulerclock, which surpassed even the results of the previous Riefler clocks;results with a precision of +/- 0,005 s/d were achieved. However, Schuler’snew type of clock had a somewhat serious drawback - it required muchmore extensive maintenance than the existing Riefler precision pendulumclocks.At the time the new type of clock was a revolutionary advancement evenif mass-production was impossible due to the extremely high maintenancerequirements. Only three of the clocks were ever produced.Source: Dieter Riefler, “Riefler-Präzisionspendeluhren 1890-1965”, Munich1991, p. 104Illustrated and described in: Dieter Riefler, “Riefler-Präzisionspendeluhren1890-1965”, Munich 1991, p. 104ff33742 G/C: 2, 20 W/M: 3050.000 - 100.000 EUR 67.500 - 135.000 USD 500.000 - 1.000.000 HKD

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