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 254
. As the worm is nothing elsethan a screw, each revolutiongiven to it will rotate thewheel a distance equal to thepitch of the worm; consequent-ly, if there are 40 teeth in theworm-wheel, a single-threadedAvorm must make 40 revolu-tions in order to turn the wheelonce. 45. A rack is a straightbar… … TEETH OF GEAR-WHEELS. 46, The object in designing the teeth of gear-wheelsshould be to so shape them that the motion transmittedwill be exactly the same as with a corresponding pair ofwheels, or cylinders, without teeth and running in contactwithout slipping. Such cylinders are called pitch…
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