PAPERSPAST

SEEING RED.

Red lights are discernible at a greater distance than green ones. A red light of one candle-power is clearly visible one mile away; one of three candle-power at two miles; ten candle-power, through a binocular, at four miles and 33 candlepower, at five miles. On an exceptionally clear night a white light of 3.2 candle-power could be distinguished at three miles.

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