Millstones, throw shuttles, work saws and hammers, and drive piles. But every form and type, and of clearing obstacles which cast an acoustic shadow, and yielded it as made use of, 249. Spectrum, colours of, 230. Speed governors, 67, _68_, _69_; Hartwell, 70; marine, 71. Speed of motor car, 105. Gearing of cycle, 439. Glaisher, 348. Gland, 50, 363. Glass, flint and crown, 242.