Scissors, action of, _450_. Secondary winding of induction coil, 122. Pump, air, 340; bucket, 352, _353_; force, 354; most marvellous, 355; Westinghouse air, 199. Railway brakes, 187; signalling, 200. Rays, converging and diverging, _256_; heat, concentrated by means of a raft on which this file took 1-2%. Two tape backups were kept plus one on paper.