Page:The Kinematics of Machinery.djvu/212

 190

�KINEMATICS OF MACHINERY.

�Another method which can be employed with the same me- chanism is the placing of a third equal crank, ~b' (Fig. 150), in the

��FIG. 148.

��FIG. 150.

plane of the other two (b and d), and connecting it with them by the links 6,3 and 6,4, while the shaft bearings are all connected with

Company's Steamers, with one cylinder vertical and the other horizontal. With the addition of a third chain similar to the first two and making equal angles with them, Fig. 147 would represent the driving mechanism of Brotherhood's "three- cylinder" engine, and the same trehle chain has also been used in much larger machines, as in the three-cylinder engine of H.M, Gunboat " "Waterwitch."

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