Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 373
can be raised or lowered by means of the rope at the bottom of themast, which is passed two or three times round a small fixed cylinder, and is united to the end of theboom by a system of blocks. By the slacking of this rope, the boom may be lowered whilst the weightis suspended, which enables the… … «*&. | Fig. 1031, represents Savages Derrick as improved by Mr. McAlpine, and used at the Brooklyn DryDock for the laying of the heaviest stone. It differs somewhat in its arrangement from the simple ma-chine already described. It will be seen that the hook for the suspension of the weight, is…
Mechanical engineering
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
