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Understanding Pendulums

Part of the History of Mechanism and Machine Science Book Series (volume 12)

DOI: 10.1007/978-94-007-1415-1

ISBN: 978-94-007-1414-4

Publisher: Springer Netherlands - Springer Journals

Apr 27, 2011

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Introduction

Pook, L. P.

Pages: 1 –6

[Perhaps the best known use of pendulums is as the basis of clocks in which a pendulum controls the rate at which the clock runs. Many clocks have visible pendulums. Indeed, the association of pendulums with clocks is so pervasive that, since the advent of quartz clocks, it is possible to buy...
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Simple Pendulums

Pook, L. P.

Pages: 7 –25

[Ideal pendulums are idealisations of real pendulums that are often used in order to make mathematical analysis more tractable. Ideal pendulums are not physically realistic. In scientific terminology, an ideal pendulum is a model of a real pendulum. Results of analyses of ideal pendulums often...
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Variations on Simple Pendulums

Pook, L. P.

Pages: 27 –41

[The simple rod pendulum is a convenient idealisation of the real pendulums often used to control clocks. Compound pendulum is the term used by horologists for a real clock pendulum, as opposed to an simple rod pendulum where the rod is assumed to be rigid and massless, with pendulum mass...
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Pendulum Clocks

Pook, L. P.

Pages: 43 –62

[In modern usage ‘clock’ refers to any device for measuring and displaying time, but not intended for carrying on the person. A pendulum clock has five essential features. Firstly, a timekeeping element: this is its pendulum which oscillates at a constant frequency. Secondly, a power source,...
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Driven Pendulums

Pook, L. P.

Pages: 63 –75

[One of the functions of the escapement in a pendulum clock is to transfer energy to the pendulum in order to replace energy lost due to friction etc. It does this by impulses whose timing is determined by the pendulum. By contrast, in a driven pendulum, energy is transferred to a pendulum by...
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Scientific Instruments

Pook, L. P.

Pages: 77 –97

[Pendulums are used in various scientific instruments, either to make measurements, or to demonstrate scientific principles. Four of these uses are described in this chapter. These are Kater’s pendulum, Newton’s cradle, Foucault’s pendulum, and the Charpy impact testing machine. If the effective...
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Engineering

Pook, L. P.

Pages: 99 –106

[Pendulums are an essential component of some engineering structures. Three of these are described in this chapter. These are the Watt steam governor, cable cars, and tension leg platforms. The Watt steam governor was invented by James Watt to regulate the supply of steam to his steam engines and...
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Entertainment

Pook, L. P.

Pages: 107 –127

[Pendulums are an essential part of some structures used for entertainment. Three of these uses are described. These are child’s swings, a child’s rocking horse, and pendulum harmonographs. Child’s swings are ubiquitous in both public playgrounds and private gardens. One of the attractions is...

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