The farmer his own builder : a guide and reference book for the construction of dwellings, barns and other farm buildings, together with their utilities, describing reliable methods, offering practical suggestions, presenting numerous details and formulas, and explaining simple rules for estimating the labor and materials required With special reference to concrete and carpentry . al developmentthan any other mechanical device. It is the first con-sideration in shipbuilding, in the erection of tall build-ings, bridges, mining, transportation, and power trans-mission—in fact, every other mechan
The farmer his own builder : a guide and reference book for the construction of dwellings, barns and other farm buildings, together with their utilities, describing reliable methods, offering practical suggestions, presenting numerous details and formulas, and explaining simple rules for estimating the labor and materials required With special reference to concrete and carpentry . al developmentthan any other mechanical device. It is the first con-sideration in shipbuilding, in the erection of tall build-ings, bridges, mining, transportation, and power trans-mission—in fact, every other mechanical undertakingand achievement. Without the tackles extraordinarybroad adaptability the most powerful engine or motorwould be virtually helpless to transmit its energy. The tackle is not only invaluable in an engineeringcapacity, but of great assistance in the most common-place forms of endeavor, as, for example, farm work—in which it is frequently necessary for the farmer to exertmore energy than is humanly possible, and where it isnot feasible to use horse power. Perhaps there is hayto be lifted to the mow, a tree to be pulled down, stumps *38 ROPES AND PULLEYS 239 drawn, a building to be moved, wire fencing to bestretched, an engine or heavy piece of machinery mustbe unloaded from freight car to wagon, and the wagon subsequently unloaded at the farm; these and many. Fig. 133.—Diagram showing parts of a block or pulley. other every-day occurrences require the use of tacklein some form or other, which will be reviewed in thischapter and described with as little technical matter aspossible. CONSTRUCTION OF BLOCKS Blocks are mechanical contrivances possessing theproperties of pulleys, usually constructed of steel orhard wood, and consist of four principal parts: theshell or outside, the sheave or wheel over which the ropeturns, the pin or axle on which the sheave revolves, andthe strap, either rope or metal, which encircles theshell and by which it is confined or secured
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphiladelphiadmckay
