After the first kodak, there came others filled with rolls of
sensitized nitro-cellulose film. Priority in the invention of the
cellulose film, instead of glass, which has revolutionized
photography, has been decided by the courts to belong to the
Reverend Hannibal Goodwin, but the honor none the less belongs to
Eastman, who independently worked out his process and gave
photography to the millions. The introduction by the Eastman
Kodak Company of a film cartridge which could be inserted or
removed without retiring to a dark room removed the chief
difficulty in the way of amateurs, and a camera of some sort,
varying in price from a dollar or two to as many hundreds, is
today an indispensable part of a vacation equipment.
In the development of the animated pictures Thomas Alva Edison
has played a large part. Many were the efforts to give the
appearance of movement to pictures before the first real
entertainment was staged by Henry Heyl of Philadelphia. Heyl's
pictures were on glass plates fixed in the circumference of a
wheel, and each was brought and held for a part of a second
before the lens. This method was obviously too slow and too
expensive. Edison with his keen mind approached the difficulty
and after a prolonged series of experiments arrived at the
decision that a continuous tape-like film would be necessary.
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