By Robert James Matthys
The Shortt clock, made within the 1920's is the main well-known actual clock pendulum ever recognized, having an accuracy of 1 moment in line with 12 months while stored 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 can be actual. during this ebook, the writer describes many clinical facets of pendulum layout and operation in basic terms with experimental facts, and little arithmetic. it's been written, taking a look at the entire varied elements and features of the pendulum in nice aspect, bankruptcy by means of bankruptcy, reflecting the measure of consciousness important for creating a pendulum run correctly. the themes coated comprise the dimensional balance of alternative pendulum fabrics, sturdy and negative suspension spring designs, the layout of mechanical joints and clamps, impression of quartz on accuracy, temperature reimbursement, air drag of other bob shapes and making s sinusoidal electromagnetic force. One entire bankruptcy is dedicated to basic methods of bettering the accuracy of standard reasonably cheap pendulum clocks, that have a distinct development to the dearer designs of considerably well-made ones. This publication will turn out precious to a person who desires to understand how to make a extra exact pendulum or pendulum clock.
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Extra resources for Accurate Clock Pendulums
But the second argument for Q, that the accuracy of a clock is roughly proportional to its Q, is one that I found to be very convincing. That a plot of Q vs the accuracy of actual working clocks should fall along a (broad) straight line, indicating a linear relationship between 32 cha pter 7 | Putting Q in perspective Q and accuracy, is something I find hard to argue with. 2, since it is the actual accuracy (estimated in some cases) of real clocks that has been plotted here. And how can this be squared with the information presented earlier in the arguments against Q—that Q is connected only to the short-term accuracy of pendulums, crystal oscillators, and atomic frequency standards—and is not connected to their long-term accuracy?
The small frequency variation can be reduced (and the imputed Q increased) by keeping the atoms longer at the higher energy level before they fall back to their lower energy level. The imputed Q affects the short-term (hours, a few days) accuracy of the gigahertz oscillator, and has no effect on its long-term (months, years) accuracy. The gigahertz oscillator’s long-term accuracy is controlled by systematic errors: magnetic shielding, cavity dimensions, atomic interactions with cavity walls, ageing of detection electronics, etc.
So the less hard or less often you have to push a pendulum to keep it going, the more accurate it will be. Yes, you can say that this is an argument for making a pendulum as 27 Accurate clock pendulums efficient as possible. And yes, you can make the efficiency number part of a pendulum’s Q. But I think that detracts from the primary idea, which is to disturb the pendulum as little as possible. Third. Without periodic re-enforcement, the energy stored in the swinging of a pendulum will die out in approximately Q cycles of oscillation, that is, the amplitude will go to zero in a time span of approximately Q cycles of oscillation.