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THE PETROL ENGINE
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end of this shaft is shown, whereas in fig. 17 a perspective view is given.
The principle of the governor will be more easily grasped
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Fig. 17
a, gear wheel shown in section; b, two-to-one shaft upon which a is mounted; c, sliding sleeve upon b; d, disc mounted on c, upon which the arms k, k act; d', position of disc d, when both cylinders are cutting out; e, circular collar upon which the hammer h rests when both cylinders are working; f, eccentric cam upon which h rests when one cylinder is cutting out; g, eccentric cam upon which h rests when both cylinders are cutting out; e', f', g' show the position of cams k, f, and f when both cylinders are cutting out; h, position of hammer when both cylinders are working; h' position of hammer when both cylinders are cutting out; j, j, weights attached to the arm k k, which fly out by centrifugal force and push c along shaft b; j', j', position of these weights when both cylinders are cutting out; k, k, arms carrying the weights j,j, which are pivoted at i, and act upon d; k' k', position of arms k, k when both cylinders are cutting out; l, exhaust valve cam. A coil spring connects the weights j, j, with the object of offering resistance to centrifugal force, which is not shown in the diagram.
by making the following simple experiment. Attach a weight to a length of string, and, holding the end of the string, revolve the hand slowly in a circle. The centrifugal force will cause the
