Induction-coil, 76, 82, 99. Induction, electrical, 74. Insulators, 44. Inventions of the ancient Greeks 7; of the nineteenth century, 88. Kite experiment, Franklin's, 46. Kites, 27. Leyden jar, 43. Lightning-rod, 48. Lines of force, 99. Liquid air, 203. Locomotive, electric, 114; steam, 155. Magdeburg, 21. Magnetic field, 80, 99. Magnets, 8, 130. Marconi, 215. Mayer, Robert, 61, 85. Mercury vapor light, 125. Microscope, 18. Miner's safety lamp, 61. Monorail car, 201. Morse, 128. Napoleon, 62. Newcomen, 34, 36. Newcomen's engine, 36. Newton, 27. Niagara, 227. Oersted, 65, 71, 111, 126. Papin, 35. Papin's engine, 35. Pascal, 25. Pendulum clock, 10, 12. Perpetual motion impossible, 87. Phonograph, 147. Principle of Work, 19. Prism, 31. Pump, 8, 19. Radium, 232. Reis, Philip, 141. Relay, 130. Roentgen, 232. Royal institution, 56, 61. Rumford, 57, 59. Rumford's cannon experiment, 59. Safety-lamp, 62. Screw propeller, 171. Siemens, 100. Spinning tops, 199. Steam-engine, 8, 25, 34. Steam locomotive, 155. Steam pressure, 23. Stephenson, 156. Storage battery, 93. Sturgeon, 97, 127. Submarines, 190. Suction-pump, 8. Symmer, Robert, 49. Telegraph, 96, 126; wireless, 208. Telephone, 140; wireless, 221. Telescope, invention of, 15; Newton's, 32. Tesla, 231. Thermometer, air, 13. Torpedo, 192. Torricelli, 19, 35. Transformer, 80, 82, 99, 227. Turbine, 163. University of Padua, 13. University of Pisa, 10, 12. Valve-gear, 37, 162. Volta, 53, 63, 89. Voltaic battery, 53, 89. Water-clock, 8, 29. Water-wheel, 165. Watt, James, 34. Watt's engine, 38. Wireless telegraph, 208. Wright aeroplane, 188. X-rays, 232. Zeppelin, 180. THE END End of the Project Gutenberg EBook of The Story of Great Inventions, by Elmer Ellsworth Burns