... 38 , 45, 49, 50, 115, 137 , 21 1, 27 4, 28 0, 28 8, 28 9, 29 6, 29 8, 35 2 noncircular gears, of, 31 8, 32 2 33 4, 33 7, 33 8, 34 1, 34 3 34 6, 34 8, 34 9, 35 5, 35 6, 35 9, 36 0Circular pitch, 39 0Clearance, 609Computer ... 99, 37 5, 38 3, 39 2, 39 5Instantaneous center of rotation, 37 , 44, 45, 48,101, 120 , 121 , 137 , 138 , 144, 27 1, 27 2, 27 4, 27 5, 28 7, 29 0, 30 2, 35 0Interference, 29 0internal gears, of, 31 4 31 6spur gears, ... 508, 538 , 656point (contact), instantaneous, 20 2, 22 5, 23 0 , 24 2, 25 2, 26 0, 26 1, 26 4, 405, 408, 414, 427 , 440, 441, 444, 508, 525 , 533 , 538 ,656Contact ellipse, 23 4 24 0, 24 7 24 9Contact lines, 38 7 38 9,...