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17th century abacus acid ancient Egyptians axle balance battery beads beam began blade bow drill bronze bulb calculating called candle cast cathode ray tube cathode rays cell century a.d. chemicals China Chinese Christian Huygens clock coated color copper created cylinder daguerreotype daguerreotype camera developed device dial diaphragm disks early earpiece Edison electric current electrode Electron tubes Europe film fire flint gear glass Greek scientist hammered handle heat holes images invented iron ivory lantern LANTERN CLOCK later lens lenses light machines measure mechanical mill movable type moving NAPIER'S BONES needles numbers object Pattern welding piston plastic printing produced pump radio waves record rods Roman rotated screen shaft shape silicon chip simple spinning steam engine stick stone stylus tape telephone telescope Thomas Edison Thomas Savery Thomas Tompion thread transmitted vibrations voltage wheel WILHELM ROENTGEN wire wood wooden zinc