. Scientific American Volume 84 Number 05 (February 1901) . A GASOLINE TRIMOTO VEHICLE. ful if this arrangement, although good exercise forthe muscles of the arm, will develop the maximumpower. SUBMARINE SIGNALING. BY ARTHUR J. MLNDY. When the idea of a submerged signal first occurredto the writer he foresaw that he would be unable todevelop it properly without the assistance of somemaster mind accustomed to wrestle with nature forher secrets. He therefore invited his friend, thelate Prof. Elisha Gray, of telephone fame, to join himin the undertaking, and received in reply an enthusi-astic acc
. Scientific American Volume 84 Number 05 (February 1901) . A GASOLINE TRIMOTO VEHICLE. ful if this arrangement, although good exercise forthe muscles of the arm, will develop the maximumpower. SUBMARINE SIGNALING. BY ARTHUR J. MLNDY. When the idea of a submerged signal first occurredto the writer he foresaw that he would be unable todevelop it properly without the assistance of somemaster mind accustomed to wrestle with nature forher secrets. He therefore invited his friend, thelate Prof. Elisha Gray, of telephone fame, to join himin the undertaking, and received in reply an enthusi-astic acceptance. Prof. Gray brought to the subjecta wide knowledge of the laws of acoustics in theirrelation to electrical science, which has enabled himto overcome difficulties that have heretofore SUBMARINE SIGNALING. An experimental boat christened the Sea Bellwas built and equipped with an 800-pound bellto be operated electrically, the necessary powerbeing supplied by a small dynamo driven by agasoline engine. This bell is lowered into thesea through a well-hole directly in the center ofthe boat until it is twenty feet below the an ingenious mechanism it may be eithertolled continuously or made to ring any desirednumber or numbers, at the will of the operator,who is thereby enabled to send intelligiblemessages, each letter of the alphabet being repre-sented by a given number. The sound thus produced under water maybe heard from a passing ship at a distance of, say,a mile or more, provided the observer go belowin the hold of the vessel as close to the keel aspossible and listen, just as he would listen foran air signal on deck. The sound waves producedby the bell come through the water and pene-trate the skin of the ship, diffusing themselvesin the atmosphere of the
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