Practical mechanical drawing and machine design self taught .. (1907)
Westinghouse, Charles. [from old catalog] · Chicago, F. J. Drake & co. · leaf 146
, all the irregu-larities in the original being reproduced in the MECHANISMS 143 copy. As copying meclianisms are very frequent-ly associated with parallel motions, it will be ad-visable, at this stage, to consider them. The most familiar copying mechanism is thepantograph, which may exist in… … Fig. 222. C are coUinear in one position, they are collinearin all positions of the mechanism. In each figure,0 is a fixed center, and the point C traces out acurve exactly similar to that traced out by A,whatever the shape of that curve may be. Thisifollows from the fact that the ratio of the…
Mechanical drawing · Machine design
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