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MANAGERS AND PROJECTIONISTS
Screen Surfaces, Characteristics
General Remarks
Statement of purpose of screen surface tests. .. .483, 484
Whom must we thank for the highly valuable data on Characteristics of Screen Surfaces ? 483
Is it advisable to consider for purchase any screen which has not been submitted to its manufacturer for test? 483
Where may tests of screen surfaces hereafter submitted for test be found in printed form? 483
To what is the brightness of screen surfaces directly proportional ? 485
What substance is used with which to compare the reflection powers of screen surfaces, and why is the value of that surface placed at 100 percent?... 485
In measuring the various surfaces how was the incident light projected and how was the photometer placed? 487
Is magnesium carbonate, the surface used for comparison, practically independent of viewing angle in the matter of reflection power ? 487
May and do some surfaces have a higher reflection power than that of magnesium carbonate, the test surface when they are viewed from straight in front? 487
What does a reflection factor greater than that of the test surface really mean ? 487
Into what three general classes have screen surfaces been divided for purposes of comparison, and what does each class include ? 488
Only two items have been considered in discussing characteristics of screen surfaces. What are they? 488
What other items should be considered when purchasing a screen ? 488
Which class of surface is included in table 3, page 492d? 488
What does "Ratio" and "R," table 3, mean, and how are the values computed ? 488 to 492
What is the type of theatre each of the three classes of screen surface is adapted for use in?.. 492
What is the most logical thing to consider in selecting the type of screen surface to be used in any particular theatre ? 492
What element other than that suggested by the previous question must also be considered? 492a
What should be the limiting value of brightness on the axis and at extreme viewing angle be? 492a
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