The Best Light At Sea

Chicago Record: Some interestlng experiments have been made on the visibility of the electric light at sea by the governments of the United States, Germany and the Netherlands. The word "visible" In the report on the tests means visible on a dark night with a clear atmosphere. The result of the experience of the Germán commlttee was that a white light of one candle power was visible 1.4 miles, on a dark, clear night, and one mile on a rainy night. The American tests resulted as follows: In very clear weather a light of one candle power was plaínly visible at one nautlcal mile; one of three candle power at two miles; one of ten candle power was seen by the aid of a binocular at four miles; one of twentynine candle power faintly ot five miles. On an exceptionally clear night a white light of 3.2 candle power was readily distinguished at three miles; one of 5.6 candle power at five miles. In the Dutch experiments the results were almost similar, but a sixteen candle power light was plainly visible at five miles. For a green light the power requlred was two for one mile, fifteen for two miles, fifty-one for three miles, and 106 for four miles. The result of tests wlth a red light were almost identical with those with green, but it was conclusively proved that a white light was by far the most easily seen.