ation to fire such a mine,since all that is necessary is tbplace the .two contact screws,projecting from the side of thesmall box containing the trans-mitter, in contact with theground: When the button ia January 18, 1902. Scientific American 41 pressed the electricity flows through the… … be pointed out that the process of tuning is so simplethat a single engineer with one transmitter could fireany number of mines of different tunes, provided hekept a record of the various tunes of the receiver, andadjusted his transmitter accordingly, whenever he wished to explode aparticular mine.…
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