Accurate Clock Pendulums by Robert James Matthys

By Robert James Matthys

The Shortt clock, made within the 1920's is the main recognized actual clock pendulum ever recognized, having an accuracy of 1 moment in line with yr whilst 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 may be actual. during this ebook, the writer describes many medical elements of pendulum layout and operation merely with experimental info, and little arithmetic. it's been written, the entire varied components and features of the pendulum in nice element, bankruptcy by way of bankruptcy, reflecting the measure of consciousness worthwhile for creating a pendulum run correctly. the themes coated comprise the dimensional balance of other pendulum fabrics, strong and bad 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 entire bankruptcy is dedicated to easy methods of bettering the accuracy of standard reasonably cheap pendulum clocks, that have a unique development to the costlier designs of considerably well-made ones. This e-book will turn out worthwhile to somebody who desires to know the way to make a extra exact pendulum or pendulum clock.

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There are other ways of doing this, but the basic approach should be evident. The location of the axis of rotation changes slightly with the pendulum’s swing amplitude. If desired, one can determine how much the axis of rotation moves by measuring y at different swing amplitudes, and then plotting y vs the swing amplitude on a graph (see Chapter 5). 20 cha pte r 5 Does a pendulum’s axis of rotation shift with amplitude? 1. Distance of axis of rotation below top end of suspension spring vs swing amplitude.

When the temperature falls, a positive permanent time error occurs. When the temperature rises, a negative permanent time error occurs, so the two errors would appear to cancel, at least partially. The critical issue is whether the permanent time errors cancel completely when the temperature changes in opposite directions at different rates (the usual situation) but with the same total rise and fall in temperature. I do not know yet. My test data is conflicting on this issue, some of it saying yes and some saying no.

1, with the scatter inherently getting larger as the swing amplitude gets smaller. 1 is visually drawn through the center of data scatter, and shows that the axis of rotation does move downward slightly (down the suspension spring), as the pendulum’s swing amplitude increases. 2 0 2 4 6 8 Swing amplitude (deg) (half angle) 10 21 Accurate clock pendulums amplitude increases, but in reality a pendulum actually slows down with increasing amplitude. Apparently there are other bigger factors present.

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