(NUMBER 38. iron plates—the leather extending slightly THE SCIENTIFIC AMERIOAN, beyond the peripheries of the iron disks. A PUBLISHED WHEELY, … itself in forcing apart the piston heads. But a perpendicular longitudinal section. The same distinct combination claimed in the patent may them, however trifling, is of no small impor- the piston heads being connected together by letters refer to like parts on all the figures. tance to the…
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