Page:The Kinematics of Machinery.djvu/313

 REVERSE AND CONVERSE CRANK& 2^1

hyperbolae ( 47), the form of which necessarily makes it some- what difficult to realise the motions they represent.

FIG. 209.

The contracted formulae for these mechanisms must, in the first place, make their characteristic property of anti-parallelism clear, we therefore put its symbol between those of the cylinder

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FIG. 210.

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pairs. The chain, unfixed, will then be written (C" 2 ' Z 6" 2 '). The reverse anti-parallel cranks will be (C'^C'^f or (C" 2 'zC' 2 ') b, of which formulae we need use only one, let it be the former,

u 2