Dead point, 47. De Brouwer stoker, 401. Detector in Chubb lock, 436; Yale lock, _436_, _437_. Yellow spot, in eye, 251. Spring balance for watches, 425. Rods of Corti, 274. Ruhmkorff coil, 121, _122_. Safety-valve, 32, _33_, 391. Sand-glasses, 411. Scissors, action of, _450_. Secondary winding of dynamo, _173_. Shunt wound dynamo, _173_. Sight, long and 3 revolves 4 idly on its way.