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telephonyselenium and photoelectric cellsneon lamp
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accuracy accurate alternating current amount of light angles appear arrangement Autochrome blue cathode cause chapter coil colour photography corresponding course crest degree diaphragm direct current direction disc distance effect electric electromagnet example experiment exposures film filter frequency give given glass gramophone record green gyroscopic Heaviside layer hydrophone illumination inch indicate instrument intensity large number lens magnetic means measure ment method micrometer microphone mirror motion movement moving necessary negative neon lamp object observation obtained operation oscillograph panchromatic persistence of vision photo-electric cell photographic picture placed plate position possible practical principle produce range rapid rays realised receiving record reflected result revolving rotation scale screen seen selenium shown in fig similar simple sound track sound waves speed station stroboscopic submarine signalling surface tints tion transmitting tuning fork utilisation vernier vertical vessel vibration wave length wheel wire wireless signals wireless waves