By Robert James Matthys
The Shortt clock, made within the 1920's is the main recognized actual clock pendulum ever identified, having an accuracy of 1 moment according to yr whilst saved at approximately consistent temperature. just about all of a pendulum clock's accuracy is living in its pendulum. If the pendulum is actual, the clock may be actual. during this booklet, the writer describes many medical elements of pendulum layout and operation only with experimental info, and little arithmetic. it's been written, the entire diversified elements and elements of the pendulum in nice element, bankruptcy by means of bankruptcy, reflecting the measure of awareness worthwhile for creating a pendulum run thoroughly. the subjects lined contain the dimensional balance of alternative pendulum fabrics, reliable and bad suspension spring designs, the layout of mechanical joints and clamps, impact of quartz on accuracy, temperature repayment, air drag of alternative bob shapes and making s sinusoidal electromagnetic force. One entire bankruptcy is dedicated to basic methods of bettering the accuracy of standard inexpensive pendulum clocks, that have a special development to the costlier designs of considerably well-made ones. This publication will end up useful to somebody who desires to understand how to make a extra exact pendulum or pendulum clock.
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Additional resources for Accurate Clock Pendulums
5 days for an invar rod. About 90–95% of the total accumulated time error occurs in the first 5-day interval after the pendulum is hung. The pendulums continue to stretch beyond this time period at an exponentially decreasing rate. The accumulated time error is much larger for the invar rod than for the quartz rod. Note that the whole pendulum is involved in the experimental numbers, not just the pendulum rod by itself. I have no explanation for the big difference between the calculated and measured time errors.
Woodward. My own right time, Oxford University Press, 1995, pp. 124–5. D. Allan and H. Hellwig. “Time deviation and time prediction error for clock specification, characterization, and application,” Proc. Position Locat. Navig. Symp. (PLANS), 1978, p. 29. D. Allan. “Time and frequency (time-domain) characterization, estimation, and prediction of precision clocks and oscillators,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control UFFC-34(6) (November 1987), 647–54. D. Bateman. “Electronically maintained precision pendulum clock— longer term performance,” Hor.
Deg. 3 s/day/deg. of swing (half angle). 22 cha pte r 6 Some practical properties of quartz The big attraction of quartz as a pendulum material is its good dimensional stability over time. Stability over time is the biggest and most needed characteristic in an accurate pendulum. In contrast to invar, which was known to be unstable almost from its beginning, quartz has a long history of being a stable material. For over 50 years, quartz has been the preferred material for optical flats and telescope mirrors, both of which are highly demanding in terms of stability.