Page:The Kinematics of Machinery.djvu/573

 ROBERTSON'S ENGINE.

�551

�which require to be turned through 90, the signal is connected with the link e. Of the links in this reduced train c and / are normal crossed links, a and e have parallel cylinders ; the links b and d are omitted. The two open cylinders 2 and 4 of the link c have therefore higher screw motions relatively to the full cylinders of a and e upon which they work. In order to complete the chain it would be necessary to add the two links b and d, (which are each in the form C~ ...\\...P +, and to make the elements in c a pair of open prisms.

���FIR. 392.

�FIG 393.

�Robertson's steam-engine * is another mechanism of the same kind, its leading train is represented by Fig. 392. The link a has the form C+...\\...C+ ; the link 6, C-...\\...P+, is omitted, but c is still left. On account of the omission of b the latter has no longer

Journal, 1874, vol. 213, p. 183.
 * Artisan, vol. xxix., 1871, p. 2 ; Revue Tndustrielle, June, 1874, p. 192 ; Dingler's

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