Understanding ScienceDiscusses the basic principles of the biological and physical sciences and the ways scientists have discovered and applied these principles. |
Contents
PUTTING ELECTRICITY TO WORK | 7 |
THE TELEPHONE | 8 |
THE GRAMOPHONE | 9 |
Copyright | |
11 other sections not shown
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action aeroplane ailerons air molecules alternating current atomic weight ball battery blades bombard broadcasting bump called camera carbon carrier waves causes changed Chapter chemical coil colour crank pin diaphragm discovery dots Edison elec electric current electric impulses electricity flows electromagnetic electron gun electron stream electronic valve electrons move elements energy engine cylinder eyes faster filament film fire fuel germanium glider grid heat helium high pressure hydrogen hydrogen atoms iconoscope internal-combustion engine invented iron lens magnetic field metal microphone motion motor move back negative neutrons nucleus orbit oxygen particles petrol vapour photographic phototube picture piston plane plate produce propeller protons push radar radio waves reaction engine record retina rocket rods and cones rotor scientists screen shaft shutter signal silver bromide sound track space station spark speed steam engine telephone television tiny transistor trons tube turbine uranium varying vibrate voltage WAC Corporal wings wire