. Mining and Scientific Press . Many mill has Just been lifted clearof the ground, n was used in clearing away about 90% of. Improvised Derrick, lifting Half of a Many Mill The mast a and the boom b were both made from tele-graph poles. The ma9t is carried at the foot by the pivot d,held by the guy-ropes e. The boom is pivoted at the lowerend of the mast. The rope f is connected with the upperhoist and passes over the sheave g at the top of the mastand through pulley h at the mast-head and i at the bottomof the boom. This rope varies the angle of the boom. The hoisting-rope j is connected with
. Mining and Scientific Press . Many mill has Just been lifted clearof the ground, n was used in clearing away about 90% of. Improvised Derrick, lifting Half of a Many Mill The mast a and the boom b were both made from tele-graph poles. The ma9t is carried at the foot by the pivot d,held by the guy-ropes e. The boom is pivoted at the lowerend of the mast. The rope f is connected with the upperhoist and passes over the sheave g at the top of the mastand through pulley h at the mast-head and i at the bottomof the boom. This rope varies the angle of the boom. The hoisting-rope j is connected with the lower hoist andpasses under the sheave k en the mast, over sheave 1 onthe boom and through the pulleys m and n. This is therope which suspends the load. The derrick is swung by hand, although another LittleTugger could do this work also if it were desired. In this Little TuooerHoist *
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Keywords: ., bookcentury1900, bookdecade1900, booki, bookpublishersanfrancisco
