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Early Civilizations and Great Thinkers of
The Progress of Science and Invention in
Developments in the Mechanical Age
8 other sections not shown
airplane alternating current amazing amplified Archimedes atom Bell called camera capacitor carrier wave cars cathode century circuit convex lens crude cylinder diagram dial disc double convex Edison Edison Effect electric current electrical pulsations electromagnet electrons energy engine enormous experiments filament film flow frequency gasoline glass grid heat heavy huge hundreds idea important improvements inside invention inventor iron known lens Leyden jar light lines of force loud-speaker machine machinery magnetic field mathematics mechanical metal plate miles millions modern Morse motion motor movie moving picture needle negative neutrons nonconductor nucleus paper patent photoelectric cell photograph piston placed plane poles practical principle printing produced recording rods rotation scientists screen sending sent Sholes shows sound speed started steam tape telegraph telephone telescope teletypewriter television theory tiny tion turn typewriter uranium vacuum tube varying vibrations Walter Hunt wheel York