Model making; including workshop practice, design and construction of models, a practical treatise for the amateur and professional mechanic .. (1919)
Yates, Raymond F. (Raymond Francis), 1895- ed · New York, The Norman W. Henley Pub. Co. · leaf 326
mills,and especially in construction work. It consists of a mast, Fig. 232, to which a boom or jib 322 A Model Crane 323 is attached so that it may swing up or down. A movablepulley with a hook is run from the end of the boom.These two elements, the boom and the hook, are sepa-rately controlled by… … Fig. 233—The derrick assembled of the derrick, and its use did not bring forth as manyobstacles as contemplated. This feature can be used inmany other models, as it is easily and cheaply con-structed. It merely consists of angle tin held together by meansof very small rivets. Iron round head…
Machinery
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