The modern steam engine, theory--design--construction--use; a practical treatise by Richardson John

Author:Richardson, John
Language: eng
Format: epub
Tags: Steam-engines
Publisher: London, A. Constable & co. ltd.
Published: 1908-03-25T05:00:00+00:00

shown in Fig. 170. The force which maintained them in that

position so long as they revolved at that speed was the same

centrifugal force. Whether either of these illustrations .suggested themselves to

James Watt, when his fertile mind invented the governor, we know not; but the apparatus he invented for controlling the speed of engines was based upon the same idea. Having got the idea of revolving balls rising constantly Fio. 170. higher with increase of

speed, all that was needed

was to connect them in some way with a valve, which should

close as they rose and open as they fell, and this is what was

done.

Watt's governor is shown in Fig. 171. To each of the

revolving arms a jointed link is attached, also joined at the

lower end to the sleeve A ; this sleeve is free to slide up and

down ^ far as the links will allow it; it is evident, therefore,

that as the governor balls rise, the

sleeve will rise also. A forked lever

fitting between the collars of the

sleeve, rises with it, and, by means

of suitable cranks and rods, opens

and shuts the butterfly valve shown

in Fig. 172.

But little examination of Fig. 171

will be needed to show that whatever

speed of revolution is necessary to

cause the balls to move from position 1, a greater speed is necessary

to cause them to rise to position 2;

a much greater speed still would be

required to move them much above

that position, while an infinite speed could not raise them

above position 3.

The Most people are familiar with the oscillation of

Pendulum, ^j^^ pendulum of a clock, and many will have noted

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