INDEX.

Li Hung Chang, 157. Lindsay, James Bowman, 145. Lines of force, 116, 162. "Linking up," 65. Locks, 430; Barron, 433; Bramah, 437; Chubb, 433, 434; Hobbs, 437; simplest, 431 ; tumbler, 432 ; Yale, 436 . Locking gear for signals, 205. Locomotive, electric, 178; advantages of, 179. Lungs, 359. Magic-lantern, 263, 264 . Magnet, 115; permanent, 115, 116; temporary, 115. Magnetism, 115. Magnetic needle, influence of current on, 129. Mainspring, invention of, 412. Malleus, 272. Marconi, 140, 146. Marine chronometers, 415;