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MANAGERS AND PROTECTIONISTS
263
62 per cent, of its brilliancy, while at an angle of 70 degrees its brilliancy has dropped tc 31.1 per cent. Remember that all these percentages are percentages as compared to magnesium carbonate. In other words, it has enormous "fadeaway" when viewed at an arerle, though up to about 25 degrees it, while reflecting far below its straight-in-front brilliancy, still is equal to the magnesium carbonate surface, and anywhere within that range it is superior.
And now let us see exactly what that means. In Fig. 76 we have the representation of an auditorium 80 feet wide by 70 feet front to back. The individual can select the side lines which fit the width of his own theatre. Each of the small squares is 10 feet each way.
TABLE 14 COMMERCIAL SURFACES TESTED
No.
DEGREES OF ANGLE
0
5
10
15
20
30
40
50
60
70
10
268
256
215
168
120
64.8
34.3
21.8
16.8
14.2
11
300
284
255
206
167
93.9
52.2
26.5
17.0
13.3
12
208
203
188
161
134
85.0
53.3
33.0
22.4
18.3
13
177
174
165
143
122
85.9
53 0
33.0
23.8
17.7
14
72.9
72.2
70.8
70.5
60-4
68.9
68.1
68.8
67.0
64.0
15
286
273
229
173
129
66.0
33.0
21.4
15.2
13.7
16
311
288
234
180
125
66.0
35.0
21.7
15.6
14.0
17
230
220
200
171
141
83.1
47.4
29.6
20.3
16.0
18
208
197
177
152
127
80.6
47.9
34.3
24.3
19.9
19
186
183
160
146
120
79.8
47.9
31.3
22.2
17.6
20
66.4
66.3
65.2
63.6
62.4
61.0
60.4
60.0
59.3
58.9
21
326
308
270
204
157
76.0
38.6
25.7
15.0
12.5
22
355
339
274
207
149
71.7
35.8
21.7
15.0
12.8
23
315 ,
298
256
203
151.
77.9
38.9
23.0
16.1
13.0
24
334
323
276
215
160
82.9
10.0
24.5
16.6
13.8
25
154
151
136
112
97.0
75.1
56.0
52.9
47.0
43.0
26
193
187
154
i24
98.5
72.2
58.4
50.2
45.2
40.9
27
142
137
122
103
93.6
76.4
63.7
55.6
50.8
46.8
28
71.7
71.7
70.8
60.9
60.2
68.6
67.1
66.0
65.3
64.8
29
126
120
116
104
90.7
68.8
47.1
34.3
26.5
21.9
30
183
172
157
134
107
65.0
42.1
28.8
20.9
16.8
31
244
240
177
116
75.6
45 5
40.0
39.6
41.7
43.7
32
140
138
113
91.4
78.6
60.9
54.8
50.8
50.4
50.0
33
142
138
120
100
99.0
73.4
49.5
35.7
27.4
22.5
34
292
271
216
160
198
49.2
28.4
17.4
13.1
9.7
35
78.6
78.6
74.9
73-3
71.1
68.6
65.3
63.9
62.3
59.5
36
148
136
111
93.6
74.1
50.2
34.1
26.5
22.6
19.5
In table 14 we see that the angle of highest efficiency lies either within or very near to 20 degree lines for ordinary commercial screens, and that beyond 30 degrees all the surfaces except 14, 20, 28 and 35 (which same have low reflec