d to describe the straight line d b h. Inthis figure the line a 6 is half the length of one arm of the le-ver beam, and the radius bar is equal to the same line, but theremay be other proportions ; all that is necessary, is that the ra-dius bar shall be equal in length, between its centres, to the… … 108 DOUBLE-ACTING ogram, this point will then be compelled to describe the straightline/ an. For the parallel motion has recently been substituted the fol-lowing arrangement, to which we have already referred as stillsimpler. To the end of the piston-rod is attached a bar, or crosshead, at right…
Steam-engines
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