By Robert James Matthys
The Shortt clock, made within the 1920's is the main recognized exact clock pendulum ever recognized, having an accuracy of 1 moment in line with yr while stored 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 might be actual. during this ebook, the writer describes many medical elements of pendulum layout and operation purely with experimental info, and little arithmetic. it's been written, taking a look at all of the varied elements and points of the pendulum in nice element, bankruptcy by means of bankruptcy, reflecting the measure of consciousness priceless for creating a pendulum run effectively. the subjects lined comprise the dimensional balance of alternative pendulum fabrics, stable and negative suspension spring designs, the layout of mechanical joints and clamps, impact of quartz on accuracy, temperature reimbursement, air drag of alternative bob shapes and making s sinusoidal electromagnetic force. One complete bankruptcy is dedicated to uncomplicated methods of bettering the accuracy of normal reasonably cheap pendulum clocks, that have a special building to the costlier designs of considerably well-made ones. This booklet will end up priceless to somebody who desires to know the way to make a extra exact pendulum or pendulum clock.
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Extra resources for Accurate Clock Pendulums
But on the more limited scale of pendulum clocks by themselves, both temperature compensation and aging are more important issues than Q, as their errors are bigger than the increased accuracy available from an increased Q. Q is scientifically connected to a clock’s short-term accuracy only. This is true whether the clock is a pendulum, a crystal oscillator, or an atomic frequency standard. And it is probably true of all clock types, but that has not been proven here. Q is historically broadly proportional to a clock’s long-term accuracy.
One at a time, various changes were made in different parts of this pendulum, to see which parts had the most effect on the permanent time error. 1. All of the testing described in this chapter is on pendulums with a 2 s period. 3. 3 was kept at 19 lb. When the bob height was changed, the bob’s diameter was also changed, so that each bob would have the same 19 lb weight. 3 shows that the permanent time error did not change much with bob height except for the tallest (12 in. 12 s for the “typical” bob with a 6 in.
Three different types of glasses were tested: fused silica (quartz), a borosilicate, and a sodalime (window) glass. They found that whatever the amount of initial strain that occurred during the first minute after the application of stress, during the following month, the strain would increase by a small amount directly proportional to the initial strain. 2% for the window glass. The increases in strain decreased exponentially with time over the 1-month interval. Moreover, when the applied stress was removed, the strain went most of the way back to zero in the first minute, but stopped slightly short of zero.
Accurate Clock Pendulums by Robert James Matthys