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every 10°, using the same scale so they could be compared. From these different plots, an average curve (shown in heavy line) was obtained for final comparison in Figure 5.
The same procedure was followed with the high gain smooth-surfaced aluminum screens. Figure 3 shows the results of
FIGURE 3 — Brightness characteristics of similar "high gain" samples of aluminum surfaced screens.
measurements of several samples of very bright surfaces and here again the average for this family was plotted for later comparison in Figure 5.
A third series of curves were plotted in Figure 4. Here samples of aluminum lenticular surfaces were used. The surfaces were all very bright, but the lenticular formation served to introduce a desired amount of diffusion so as to increase the relative amount of light energy re
FIGURE 4— Brightness characteristics of similar samples of aluminum surfaced lenticular screens.
fleeted at angles of 20° to 60° from the perpendicular. An average curve has also been plotted for this group and is shown in heavy line.
Figure 5 shows a direct comparison of the brightness characteristics of five different types of surfaces or screens. Curve 1 represents the magnesium carbonate surface. This surface is used as a standard ; it is not perforated and it shows 100% reflectivity, not only at 0°, but for all
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Ask your dealer for Bulletin 222.
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Northampton, Massachusetts New York Office: 30 Church Street, New York 7, N. Y.
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