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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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Spring suspensions for accurate pendulums

Spring suspensions for accurate pendulums

Chapter:
(p.97) Chapter 15 Spring suspensions for accurate pendulums
Source:
Accurate Clock Pendulums
Author(s):

Robert James Matthys

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198529712.003.0015

This chapter deals with the design and performance of various types of spring suspensions for an accurate pendulum clock. It also covers the three basic oscillation modes of a pendulum, the interactions between them, and the effects they have on the clock's timing accuracy. These oscillation modes affect the design of the suspension. To simplify the discussion, left-right pendulum motion is used to refer to the normal left-right motion of the pendulum bob, as viewed from in front of the clock case. Front-to-back pendulum motion refers to the front-to-back motion of the pendulum bob, again as viewed from in front of the clock case. The pendulum rod is made of invar. The lengths given for suspension springs are the free flexure lengths, and do not include the clamped portions at the ends of the springs. The springs in this chapter are made of thin flat stock, with their ends thickened afterward by clamping or soldering ‘chops’ (thicker end pieces) onto the spring's two ends.

Keywords:   suspension springs, accuracy, pendulum, oscillation modes, bob, invar, pendulum clock

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