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 255
ed the pitch circle (see Fig. 24). The pitchcircle is also called the pitch line. The diameter of the pitch circle is called the pitchdiameter. When the word diameter is applied togears, it is always understood to mean the pitch diameter^unless especially stated as the diameter over all ordiameter… … Fig. 34. pitch.. This is obtained by dividing the circumference(pitch circle) by the number of teeth, and is used in layingout the teeth of large gears and, also, when calculatingtheir strength. It would be very convenient to have the circular pitchexpressed in manageable numbers like 1-inch, f…
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