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Society of Motion Picture Engineers : incorporation and by-laws (1927)

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Polygonal FloodJiglif Mirror — Benford and Palmer 117 the loss of light through the interference of the barrel, and curve C is the form of characteristic obtained by actual test. The disagree FiG. 6 — A studv of face shadows from a 15 section polygonal mirror at 25 feet distance. ment between the two is probably due to the fact that only six readings were taken at each point in the beam. The quantit}^ of light in the full beam is computed to be 322,000 lumens, and the barrel interference reduces this to 254,000 lumens. This light includes the orange light of the flame, and the floodhght