Henry Ernest Dudeney/Puzzles and Curious Problems/322 - The New Gun

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Puzzles and Curious Problems by Henry Ernest Dudeney: $322$

The New Gun
An inventor undertook that a new gun which he had manufactured, which when once loaded,
would fire fifteen shots at the rate of a shot a minute.
A series of tests were made, and the gun certainly fired fifteen shots in a quarter of an hour.
However, the Government refused to buy the gun, on the grounds that it did not do the job as advertised.
Why?


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Sources