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- [1922]
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- July 19, 2022
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- MANAGERS AND PROJECTIONISTS 175
The main point in deciding upon the focal length
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- [1922]
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- MANAGERS AND PROJECTIONISTS 619
projection lens will depend upon the distance of the
- Date:
- [1922]
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- /80 of a second. We may therefore say that at the rate of sixty feet per minute, 4/80
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- , because the construction of its support is such that the coils are left free to expand
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- [1922]
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- MANAGERS AND PROJECTIONISTS 207
'projector gate and turned the revolving shutter until
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- [1922]
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- MANAGERS AND PROJECTIONISTS 617
possible condition the greater the percentage of the
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- [1922]
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- 360 HANDBOOK OF PROJECTION FOR
First disconnect the wire leading from the rheostat to
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- [1922]
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- 152 HANDBOOK OF PROJECTION FOR
of the lens to the screen to be 6 inches, and the
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- MANAGERS AND PROJECTIONISTS 541
as per instructions mounted on front cover of the
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- [1922]
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- using 25 amperes, the rate of interruptions of the light may be as low as 36 per second