By Robert James Matthys
The Shortt clock, made within the 1920's is the main well-known exact clock pendulum ever identified, having an accuracy of 1 moment in keeping with yr while saved at approximately consistent temperature. just about all of a pendulum clock's accuracy is living in its pendulum. If the pendulum is exact, the clock should be exact. during this ebook, the writer describes many medical facets of pendulum layout and operation basically with experimental facts, and little arithmetic. it's been written, all of the diversified components and points of the pendulum in nice element, bankruptcy by means of bankruptcy, reflecting the measure of realization invaluable for creating a pendulum run safely. the themes lined contain the dimensional balance of alternative pendulum fabrics, sturdy and terrible suspension spring designs, the layout of mechanical joints and clamps, influence of quartz on accuracy, temperature repayment, air drag of alternative bob shapes and making s sinusoidal electromagnetic force. One entire bankruptcy is dedicated to uncomplicated methods of enhancing the accuracy of standard reasonably cheap pendulum clocks, that have a special development to the dearer designs of considerably well-made ones. This publication will turn out valuable to an individual who desires to understand how to make a extra exact pendulum or pendulum clock.
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Extra resources for Accurate Clock Pendulums
Even with a fixed Q, a clock accuracy variation of 1000 to 1 certainly leaves plenty of room for an individual clockmaker to express his own ideas and taste in clock design. Discussion I was not much impressed with the first argument for Q, as all of the components in its error equation were previously known. That is, to make an accurate pendulum clock, impulse it at the center of swing, as constantly and repeatedly as possible; and make the pendulum as efficient as possible, so that the impulse is as small as possible and disturbs the pendulum as little as possible.
Others have noticed the dichotomy that Q is not related to long-term accuracy but is related to it anyway. Workers at the National Institute of Standards and Technology (NIST) in Boulder, Colorado, USA, in their ever-continuing search for ever more accurate oscillators and time standards, have noticed that the standards with good long-term stability always seem to have high Q, even though the high Q is not needed for long-term stability. There must be a connection there somewhere, but even they do not know what it is.
If a shorter 2–4-month interval is used, it is too easy to pick an interval between rate jumps and get a clock accuracy number that is better than the long-term performance actually is. Arguments for Q First. Starting from a general equation of motion and assuming a sinusoidal driving force, Bateman  derived an equation showing that the frequency error ⌬ in the frequency of a clock is proportional to the angle variation ⌬␤ in the basic drive angle ␤, and that it also varies inversely with both Q and the sine squared of the basic drive angle ␤: ⌬ ϭ ⌬␤ .