Download e-book for kindle: Accurate Clock Pendulums by Robert James Matthys

By Robert James Matthys

ISBN-10: 0191513687

ISBN-13: 9780191513688

ISBN-10: 0198529716

ISBN-13: 9780198529712

The Shortt clock, made within the 1920's is the main recognized exact clock pendulum ever recognized, having an accuracy of 1 moment consistent 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 actual, the clock may be exact. during this e-book, the writer describes many clinical points of pendulum layout and operation purely with experimental info, and little arithmetic. it's been written, taking a look at all of the assorted components and points of the pendulum in nice aspect, bankruptcy by means of bankruptcy, reflecting the measure of consciousness worthy for creating a pendulum run appropriately. the subjects coated contain the dimensional balance of alternative pendulum fabrics, sturdy 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 entire bankruptcy is dedicated to uncomplicated methods of enhancing the accuracy of standard reasonably cheap pendulum clocks, that have a special building to the dearer designs of considerably well-made ones. This e-book will end up precious to an individual who desires to understand how to make a extra exact pendulum or pendulum clock.

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Additional info for Accurate Clock Pendulums

Example text

0003 s/day), and the Q range is 227 to 1 (500,000 to 2,200). 3. 22 ЊC) away from its calibration temperature. 3. Q vs accuracy for pendulum clocks only. ЊC. 1 s/day. 3 says that you are not going to get much of a pendulum’s accuracy capability unless you compensate it for temperature. 008 s/day. This band represents the range of rate jumps found in the time error vs time records of an assortment of pendulum clocks. 62 s/day). 3 s/day), and the pendulums usually ran smoothly at their new rate for 2–6 months before some of them exhibited another rate jump.

This chapter represents the author’s understanding of it, and is presented here to promote discussion of its relative worth to the pendulum clockmaker, as distinct from the needs of those working with atomic frequency standards. If one measures the time difference between his clock and the radio time standard WWV, measures it every day or so1 over a year’s time, and then plots it up on a graph as time error vs time, one has an almost perfect picture of his clock’s time performance. It shows what the clock’s time error was over a reasonably long period of time, and shows at a glance how accurate the clock was.

2. 1 in. 9 in. long. 3. Permanent time error vs bob height. All bobs 19 lb brass cylinders. 1. Changes in the permanent time error caused by various changes in a “typical” temperature compensated pendulum. 2.

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Accurate Clock Pendulums by Robert James Matthys


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