Although rifling had been tried on small arms since the 15th
The piece was rifled, which allowed for a much more accurate and powerful action. Although rifling had been tried on small arms since the 15th century, the necessary machinery to accurately rifle artillery only became available in the mid 19th century. Martin von Wahrendorff and Joseph Whitworth independently produced rifled cannon in the 1840s, but it was Armstrong’s gun that was first to see widespread use during the Crimean War. The cast iron shell of the Armstrong gun was similar in shape to a Mini ball and had a thin lead coating which made it fractionally larger than the gun’s bore and which engaged with the gun’s rifling grooves to impart spin to the shell.
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