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November, 1926
AMERICAN' C I N E M A T O G R A P H E R
Seventeen
being so small that it cannot be detected by man, but this difference of velocity is readily visible in denser media, which fact will be thoroughly investigated in the course of this study.
The velocity and length of undulations, being greater for the red light, correspond to a deep sound, while coming down through the series of visible colors to the violet, we find these shorter and slower undulations, to correspond to a sound of high pitch.
The phenomena of heat is also very closely related with the phenomena of light, and we speak of a caloric ray, in the same manner and with the same meaning as we speak of a ray of light.
Heat, is, as light, theoretically transmitted by undulations of the ether and the greater the velocity of heat undulations, the greater is the sensation of heat.
A remarkable, palpable evidence of the possible truth of the undulatory theory, is given by the fact that if we decompose white light into its composing colors (Rainbow) and with a delicate thermopile we ascertain the difference of heat produced by each colored light, we find the thermopile scarcely affected by the Violet, but gradually indicating an increase of heat in the Blue, Green, Yellow, Orange respectively, up to the Red, at which color the temperature is greater, indicating thus a greater velocity of the heat undulation, just as a greater velocity of the light undulations has been proven to exist for the red than for all other colors.
Ether undulations, producing different phenomena, have been measured with great accuracy, and their length varies from the longest known radio waves, having a length of 40,000 meters, to the recently discovered cosmic rays whose length has been measured by Prof. Millikan of the California Institute of Technology and found to be 0.000,000,000,040 millimeters.
According to the undulatory theory, a disturbance, originated at any point of the ether by a luminous body, is propagated as a spherical wave in all directions around that point, and its velocity is uniform.
Now, if we consider one point of the eye or of an optical instrument, turned towards the origin of the disturbance, we can visualize the particular part of the light-wave that strikes that point, and call it a ray of light.
Tt is of great importance for the student to have a correct conception of what we call a
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