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Movies for TV - Early Television Foundation

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PRINCIPLES OF MOVIES 75<br />

Fig. 1-3. Houston contact printer <strong>for</strong> 16 mm film.<br />

image remains <strong>for</strong> a finite period. When a movie film is made, the<br />

camera records a number of pictures of the action taking place,<br />

each one slightly different from the previous one. These pictures<br />

are made at the rate of twenty-four every second (Note: every<br />

reference in this book to film speed will assume a speed of twenty -<br />

four frames a second, unless stated otherwise ) , which is the speed at<br />

which films are projected in movie theatres and <strong>for</strong> television. When<br />

these pictures are projected on the screen in rapid succession the<br />

eye sees the first one, and while the image of that one is still present,<br />

the next one, which is slightly different, is received over the top of<br />

the first. These blend, as do the subsequent ones, into what appears<br />

to be a moving picture. Although this is an effect of the human eye,

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