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Twenty
AMERICAN CINEMATOGRAPHER
November, 1926
More to it than
the public realizes —
THE public knows a good picture when it sees one — you can bet on that! What it doesn't know is the technique, photography, and lighting that makes it what it is.
But we who are "behind the scenes" know! We see the Cooper Hewitts working day and night alike. We see outdoors moved indoors. But even we are inclined to forget that the "Coops" first made it possible. The " 3oops" are always ready to serve you. Call up "Mike" Shannon and he'll see that they do.
COOPER HEWITT ELECTRIC CO.
HOBOKEN, NEW JERSEY
Hollywood Office — 7207 Santa Monica Blvd. KEESE ENGINEERING CO., John T. "Mike" Shannon, Mgr.
149 ©C. H. E. Co.. 1026
Roy Film Laboratories
The Little Laboratory with the Big Reputation
6701 SANTA MONICA BLVD. HOLLYWOOD 1944
IfALTEH J. VAN RpSSEM
6049 Hollywood Blvd. Phone HO. 0725
Commercial Photography
Slill Developing and Printing fcrtCamaas-FOR. RENT— Slill
ray of light.
When the light of the Sun is permitted to pass through a minute orifice, drilled in the wall of a dark chamber, and a thin cloud of smoke is formed in the chamber, a streak of light is made visible, which streak we commonly call a ray of light.
In fact, this streak, no matter how small the orifice may be, is composed of a number of rays, limited by the size of the orifice itself, and it may readily observed that these rays diverge from each other, forming on the wall of the chamber, opposite to the opening, a sunspot larger in size than the orifice.
These rays, may be made to take a course parallel to each other, or to converge to one point, by forcing them to pass through lenses of suitable form.
Such an agglomeration of rays, is called a "beam" or "pencil" of light, and may be parallel, divergent or convergent, according as to whether the rays composing it are parallel to each other, or if they separate from each other, or converge to a same point.
A "ray of light," is then an imponderable, immeasurable entity of light, representing the direction in which light is propagated, in reference to the observer or optical instrument; and marking the shortest distance between the luminous point and the receptive point. Now, the shortest distance between two points being a straight line, we can conceive this direction as a "geometrical straight line."
As the undulatory theory infers the existence of undulations, we shall conceive them as having a bearing on the velocity of light, but none on its direction.
It has also been ascertained that the velocity of light varies with the wave-length, this velocity being greater for the red rays and gradually diminishing for the rays of the different colors from red to violet.
It is evident that it becomes necessary to consider the velocity of light and its color, beside the "geometrical conception" of a ray of light; we can arrive at the definition of a ray of light as "the direction in which monochromatic light is propagated from one luminous point to a given receptive point."
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