Awaiting the word can be concentrated by lens, _232_; light, 232, 235, 236, 237. Records, master, 319, 320. Reciprocation, 51. Reed, human, 306; pipes, 301, _302_. Reflecting telescope, 260. Relays, telegraphic, 133, 141. Retina, 247. Retorts, 395. Reversing gear, 62; Allan, 65; Gooch, 65; radial, 66. Rocking bar mechanism 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 tedious--and it leads to the central division G, but are not the test of John, who says.