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Scientific American, Vol. 96, No. 26 (1907) (1907)

leaf 4

An illustration from Scientific American, Vol. 96, No. 26 (1907), 1907, leaf 4
American JUNE 29, 1907. … erratic manner. In some cases the Lighthouse Board gets indignant complaints that on a certain date a cer- tain fog signal was silent when it should have sounded. Investigation shows that the signal was sounding at assume he is close to it because he hears the soun: the time, but was, for some…

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