Grant, George B. (George Barnard), 1849-1917 · Boston, Grant gear works, incorporated · leaf 72
Parabolic pltchlinea Fig\ 113. … Myperholio pitch lines 70 Logarithmic Pitch Lines. 132.—THE LOGARITHMIC SPIRAL. If the radiants a, h, c, d, e, Fig. 115, makeequal angles with each other, and each oneis equal to the adjacent one multiplied by aconstant number, their extremities will deter-mine a logarithmic spiral. If the first…
Gearing
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