Daily Almanac for
Feb 16, 2012
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Dictionary


pitch' sur"face




(in a gear or rack) an imaginary surface forming a plane (pitch plane), a cylinder (pitch cylinder), or a cone or frustrum (pitch cone) that moves tangentially to a similar surface in a meshing gear so that both surfaces travel at the same speed.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

pitchstonepitchy
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