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What is Radar?
Measuring Ranges by Sound Echo
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accurate aeroplane aircraft angle of sight anode aperture atom Battle of Britain beam bearing break cathode-ray tube centimetric centre Chapter condenser crest Crown copyright reserved detect direction finding disc distance ears echo pulse electric electric charge enables ether waves exactly field of vision fighters flying frequency gen box ground range Gun-laying half-wave dipole height history of radar horizontal inches increasing positive potential indicated instruments journey kind length light waves locate locking pulse look-out means methods metres miles an hour millimetre million millionth minute navigation negative charge negative potential night-fighter pilots nucleus o'clock orbiting electrons positive charge pressure protons radar apparatus radar equipment radar receiver radio radiolocation raids reached realised revolving scale screen searchlight seen ship short waves shown in Fig signal slant range sound waves speed station stopwatch Superhet surface target transmitter trough vertically vibration wavelength wireless waves X2 plate yards