Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000215
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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MANAGERS AND PROJECTIONISTS 664 may check against any possible error. The two should, of course, total 360 except for a very slight error due to discarding fractions if that is done. Suppose, for instance, your flywheel measures 10.99 inches in circumference. 10.99x1,000=10,990, and 10,990 -*■ 360 (degrees in a circle) = 30.5277777 plus, which is where the importance of reducing the measurements to thousandths of an inch comes in, since with such an infinitesimal measurement as the thousandth of an inch, in a matter of this kind we may discard all but 30.5, since it will affect the final result but slightly, though you may use 30.52 if you wish for high accuracy, or even as many of the sevens as you care to. We now have the width of one degree in thousandths of an inch, and the measurement of the period of movement of the intermittent sprocket and film in thousandths of an inch, therefore the measurement divided by the width of one degree gives the number of degrees of the movement, and the sub Figure 230c traction of that result from 360 gives the degree in the period of rest of the sprocket, or you may, as suggested, also reduce that measurement to degrees, and thus check against possible error.