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The controlled explosion of an underwater mine to clear rocks in the East River between Harlem and the Bronx, New York. Wood engraving.
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1 print : wood engraving
Blowing up of the Hell-Gate Rocks in East River, New York. The explosion. Loading the mine. Batteries. Method of distributing cartridges. The baby fingers that exploded the mine. Positive wire negative wire. Group of wires with their leaders. Torpedo. Gravity current closer. Exploder with gutta-percha coating. Exploder. Primer. Condensed diagram showing circuit of electrical current. Batteries.
Wellcome Library no. 29270i