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Accurate Clock Pendulums$
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Robert J. Matthys

Print publication date: 2004

Print ISBN-13: 9780198529712

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198529712.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 07 March 2021

Transient response of a pendulum to temperature change

Transient response of a pendulum to temperature change

(p.47) Chapter 10 Transient response of a pendulum to temperature change
Accurate Clock Pendulums

Robert James Matthys

Oxford University Press

This chapter describes the transient response of a pendulum to a step change in temperature and explains how to eliminate the resulting permanent time error. The permanent time error can be zeroed out by a combination of moving the bob's support point to up near the top of the bob and moving the temperature compensator to a position down below the bob. The pendulum rod must have a little extra length to permit mounting the temperature compensator down below the bob. Supporting the bob at a point above the bob's center reduces the permanent time error, while supporting the bob at a point below the bob's center increases the permanent time error. Two-thirds of the permanent time error can still be eliminated just by moving the temperature compensator down to a position 2-3 inches below the bob. The spacer used to fill the compensator's former space inside the bob should be of the same material as the pendulum rod, so as not to disturb the pendulum's temperature compensation.

Keywords:   transient response, pendulum, temperature change, permanent time error, temperature compensation, bob, temperature compensator

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