It is well known that pictures in color are in common use in magazine
printing, in window transparencies, decorations, etc. The process
consisting in making three negatives, one through a red screen, a second
through a green screen, and a third through a blue screen. When
transparencies from these three negatives, each stained in its
complementary color, red, green and blue, are superimposed and viewed by
transmitted light, the resultant picture is seen in its natural colors.
With this process generally well known, it is obvious that three such
negatives transmitted by radio or wire could be colored and combined to
make a “picture sent by radio in natural colors.” Of course, the picture
is not sent in color at all, and the author hesitates to claim for such
a feat more than that the resultant picture proves the excellence of the
synchronism of the machines employed in the transmission of the three
successive pictures which after their reception are to be colored and
combined into one.
[Illustration: [Photographs]]