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17th century abacus acid ancient Egypt ancient Egyptians axle balance batteries beads beam blade bow drill bronze burned calculating called candle cathode ray tube cathode rays cell century a.d. China Chinese Christian Huygens clock coated copper created cylinder daguerreotype daguerreotype camera developed device dial diaphragm early earpiece Edison electric current electrodes Electron tubes Europe film fire flint gears glass Greek scientist hammered handle heat holes images internal combustion engine invented inventor iron lamps LANTERN CLOCK later lens lenses light machines measure metal Middle Ages modern mouthpiece movable type NAPIER'S BONES needles numbers object Pattern welding piston moves plastic printing produced radio waves recording rods Roman screen shaft silicon chip simple spinning steam engine stick stone stylus tape telephone television Thomas Savery Thomas Tompion thread turned valve voltage weights wheel wick wire wood wooden zinc