Accurate Clock Pendulums by Robert James Matthys

By Robert James Matthys

The Shortt clock, made within the 1920's is the main recognized exact clock pendulum ever identified, having an accuracy of 1 moment in line with yr whilst saved 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 e-book, the writer describes many clinical points of pendulum layout and operation simply with experimental information, and little arithmetic. it's been written, taking a look at all of the diversified elements and features of the pendulum in nice aspect, bankruptcy through bankruptcy, reflecting the measure of realization valuable for creating a pendulum run correctly. the subjects coated comprise the dimensional balance of alternative pendulum fabrics, solid and terrible suspension spring designs, the layout of mechanical joints and clamps, impression 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 enhancing the accuracy of normal reasonably cheap pendulum clocks, that have a special development to the dearer designs of considerably well-made ones. This publication will end up helpful to someone who desires to understand how to make a extra exact pendulum or pendulum clock.

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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. ) Does a pendulum’s axis of rotation move when the swing amplitude is increased?

A) Pendulum’s mechanical design and (b) locations of temperature sensors. 5 in. long. 9 in. 4 lb, and is supported at its center by a pyrex sleeve. This sleeve is usually quartz, but was changed to pyrex in this case. The pyrex sleeve provides about one-third of the temperature compensation. 8 in. long, that are located parallel to and on opposite sides of the quartz pendulum rod. These temperature compensating tubes are located in the plane of swing, and are supported top and bottom by stiff brass end caps.

This delay in the elastic response of glass is discussed further (below) by Murgatroyd and Sykes [2]. In a torsion experiment, they measured the strain response to an applied stress over a 1-month interval. 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.

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