Contents Page[Wireless Telegraphy]7[High-speed Telegraphy]28[The Telephone—wireless Telephony]39[The Phonograph—the Rotographophone—The Telephonograph]54[The Telautograph]72[Modern Artillery—Rifles—Machine guns—Heavy Ordnance—Exploxives—In the Gun Factory]83[Dirigible Torpedoes]126[Submarine Boats]143[Animated Pictures]166[The Great Paris Telescope]183[Photographing the Invisible—Photography in the Dark]194[Solar Motors]207[Liquid Air]213[Horseless Carriages]224[High-Speed Railways]258[Sea Expresses]272[Mechanical Flight]284[Type-setting by Machinery]306[Photography in Colours]317[Lighting]330