Excerpt from Radio Broadcast, Vol. 14: November, 1928, to April, 1929 At the receiving station a similar disc to that of the transmitter revolves exactly in step with the transmitting disc, and behind this disc in line with the eye of the observer are two glow discharge lamps - a neon lamp, and a lamp filled with helium and mercury vapor. The neon lamp supplies the red constituents of the light and the helium and mercury vapor the blue and green. The eye of the observer sees first a red image, then a blue image, and then a green image, the images being presented so rapidly that persistence of vision causes them to blend and the observer to see a composite image made up of these three colors. Now red, green, and blue constitute the three primary colors from which all other colors are made up: for example, purple is a combination of red and blue, yellow is a combination of green and red, and in the same way all other colors are made up of various proportions of these three primaries, red. Green, and blue. The process used in color television is exactly similar to the three-color process used in color cinematography. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.