Accurate Clock Pendulums by Robert James Matthys

By Robert James Matthys

The Shortt clock, made within the 1920's is the main well-known exact clock pendulum ever recognized, having an accuracy of 1 moment according to 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 may be exact. during this e-book, the writer describes many medical features of pendulum layout and operation in basic terms with experimental information, and little arithmetic. it's been written, the entire various elements and elements of the pendulum in nice aspect, bankruptcy through bankruptcy, reflecting the measure of consciousness valuable for creating a pendulum run competently. the themes lined contain the dimensional balance of alternative pendulum fabrics, solid and bad suspension spring designs, the layout of mechanical joints and clamps, impression of quartz on accuracy, temperature repayment, air drag of alternative bob shapes and making s sinusoidal electromagnetic force. One complete bankruptcy is dedicated to easy methods of bettering the accuracy of standard reasonably cheap pendulum clocks, that have a unique building to the dearer designs of considerably well-made ones. This booklet will end up precious to an individual who desires to know the way to make a extra actual pendulum or pendulum clock.

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The short answer is that both statements are right, but by different paths. That Q is related to short-term accuracy but not to long-term accuracy is scientifically ascertainable in the laboratory. That Q is related to long-term accuracy is historically ascertainable from actual clock records. Others have noticed the dichotomy that Q is not related to long-term accuracy but is related to it anyway. Workers at the National Institute of Standards and Technology (NIST) in Boulder, Colorado, USA, in their ever-continuing search for ever more accurate oscillators and time standards, have noticed that the standards with good long-term stability always seem to have high Q, even though the high Q is not needed for long-term stability.

And also on a global scale, Bateman’s statement that the type of oscillator is more important than the type of escapement, is true. After all, a crystal oscillator (with a Q of 1 million) is unquestionably more accurate than a mechanical wristwatch (with its lower Q of 100–1000). But suppose one decides to make one of these clock types, say a pendulum type. Then the picture changes to a smaller scale, a pendulumsized scale. And Bateman’s statement about the type of oscillator becomes immaterial, and the choice of escapement becomes relevant.

It would give some idea of the heat flow between the pendulum’s various parts, and might provide some insight into the time offset error. The time offset error occurs because different parts of the pendulum change temperature at different rates. Before and after a temperature change, the pendulum is the right length (hopefully) and runs at the right rate. But during the temperature change, the pendulum is the wrong length, due to its different parts changing temperature at different rates, and it runs at the wrong rate during the temperature change interval.

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