The book How to Draw a Straight Line a Lecture On Linkages was written by author A B Alfred Bray Kempe Here you can read free online of How to Draw a Straight Line a Lecture On Linkages book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is How to Draw a Straight Line a Lecture On Linkages a good or bad book?
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An exact motion of the same description is shown in Fig. 27. 0, (7, 0', P are the four/oa of the quadriplane shown in the figure in which the links are bent through a right angle, so that C'O P is constant, and C P a right angle. The focus is pivoted to a fixed point, and C is made by means of the extra link Q to move in a circle of which the radius Q G is equal to the pivot distance A LECTURE ON LINKAGES. 37 P consequently moves in a straight line parallel to Q, the five moving pieces thus far... described constituting the Sylvester-Kempe parallel motion. To tljis are added the moving seat and the remaining link R 0', the pivot distances of which, P R and R 0', are equal to Q. The seat in con- sequence always remains parallel to Q 0, and as P moves accurately in a horizontal straight line, every point on Fid 22. it will do so also. This apparatus might be used with advantage where a very smoothly- working traversing table is required. I now come to the second of the parallel motions I said I would show you.
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