1 of 3 floors equipped with photoelectric lighting control. Light intensity of 25 foot-candles constantly maintained. Phototube controllers changed in position to face windows at right after scene was taken. In office building of Delaware Power & Light Co., Wilmington, Dela.
Title: 1 of 3 floors equipped with photoelectric lighting control. Light intensity of 25 foot-candles constantly maintained. Phototube controllers changed in position to face windows at right after scene was taken. In office building of Delaware Power & Light Co., Wilmington, Dela.
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