TO SHUT THE HORNETS IN THEIR NESTSTaking mines aboard the U. S. S. San Francisco. Mines were planted by running them down rails which extended over the stern. This ship would plant a mine every 11½ seconds over a period of more than two hours.

AMERICA BUILT 100,000 MINESA mine depot at Inverness, Scotland. American inventors developed an electrical firing apparatus which exploded the mine if a submarine passed close to it. The explosion would occur even though there were no direct contact.

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