I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 277
ing mixed upby the multiplicity of marks sure to be found after yearsof service. 87. Keys for fastening pulleys to shafts in order to causethem to rotate together belong usually to one of the threeclasses shown in Fig. 40. The one shown at a is a concavekey that is hollowed out to fit the shaft. As… … the radius of the shaft. The flat key is shown in Fig. 40 at b,a flat surface is cut on the shaft, and, consequently, the keyis more effective than the concave key, as far as slippingunder a rotative strain is concerned. The sunk key shown inFig. 40 at c is the most effective, since it is…
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