Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 164
ipal. For raising into position a hammer beamprincipal weighing about 1 ton, two up-right poles may be used ; and a horizontalpole, as indicated in Fig. 561, should be have to lift only about half a ton ; if double-sheave blocks are used, the time occupiedin hoisting will be lessened, but more… … 11! 2iO t35 XUJO1-Q h- 1 N PI / (I JII iJ? hBH ^H If i llfiiBl
Carpentry · Joinery
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