Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . left and theother eud an equal distance to the right, compelling its middle PARALLEL MOTION. 1631 PARALLEL RULER. point A, to which the pistou-rod is attached, to reciprocate in aline which does not vary sensibly from a straight one, andwhich may for all practical purposes be considered such. Fig 3549 shows various other devices for causing parallelmotion, A was
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . left and theother eud an equal distance to the right, compelling its middle PARALLEL MOTION. 1631 PARALLEL RULER. point A, to which the pistou-rod is attached, to reciprocate in aline which does not vary sensibly from a straight one, andwhich may for all practical purposes be considered such. Fig 3549 shows various other devices for causing parallelmotion, A was used in Watfs original single-acting bL-am-en-gines; the piston-rod has a rack gearing with a seg-ment on the beam and working against a roller. B is commonly used in stationary beam-eugines. C is used for side-lever marine-engines; the parallel rodsfrom the beam or side-lever a are connected with an arm on arock-shaft b. D, another parallel motion for side-lever engines ; a & is theradius bar, and c the cross-head to which the parallel bar c Uis att;iched. E\s used only in some particular cases. F, the radius rod a is connected to the lower end of a shortvibrating rod, the upper end of which is connected with the.
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