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Feb., 1932]
PROJECTION SCREENS COMMITTEE
247
Reel 1 Interiors
Reel 2 Exteriors
Low Intensity
Brightness
4.7
Foot
7
Lamberts 3.5
1.7
4.7
Foot
7
Lamberts 3.5
1.7
Glaring
0
3
0
0
10
0
0
0
Bright
2
8
0
0
20
4
0
0
Preferred
9
17
0
1
12
18
0
0
Acceptable
26
25
3
I
16
29
7
0
Dull
18
4
41
12
0
8
39
15
Dark
2
0
14
44
0
0
12
43
Hi-Lo
11.5
Foot 17
Lamberts 8.5
4.2
11.5
Foot Lamberts 17 8.5
4.2
Glaring
10
20
0
0
13
6
0
0
Bright
14
14
1
0
20
10
2
0
Preferred
9
12
11
1
7
22
7
0
Acceptable
14
10
18
7
15
16
8
3
Dull
9
1
19
24
0
4
33
20
Dark
1
1
8
24
0
0
8
35
Screen reflection factor: 80 per cent.
Screen size: 9 by 12 feet.
Distance from screen: from 27 to 55 feet
Viewing angle* 90 =*= 30 degrees with screen.
Auditorium illumination: 0.02-0.5 foot candle.
Brightness of screen surroundings: 0.1-0.9 foot lambert.
19 Observers expressed a preference for the color of the low intensity lamp;
17 preferred the hi-lo. A foot lambert is the brightness of a perfectly diffusing surface illuminated
by one foot candle.
Analysis of Results. — Under the circumstances we cannot be too positive in our conclusions from these tests. It will be sufficient to point out tendencies and possibilities. To obtain decisive results it would be necessary to perform repeated and varied experiments lasting over a period of time. Admitting the limitations, we may proceed to interpret the data.
With reel 1 and the low intensity lamp the reactions were just what might be expected. A brightness of 7 foot lamberts was found to be quite acceptable. This reel consisted of views of a string orchestra, the players being dressed in dark, formal clothes. The brightness on the screen was of the same order of magnitude as those existing at an actual performance of such an orchestra. Obviously,