, it has a ten- DOUBLE 8TEAM HAMMER. tractions are proportional to the stresses undergone. And, dency to crystallize and hecome hard. There are some ob- Messrs. B. and S. Massey, of Manchester, have recently again, such variations in length are proportional to tbe jections to using potash, as it… … face, and that against ic there presses, under the influence or 0 of aspring, asmall sphere carried by a lever jointed toa Ordnance for Harbor Defense. fixed axis. This part is unfortunately hidden by the appa- designed double steam hammer. There are, as shown, two ratus (Fig. 2). Every motion of…
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