Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 222
Fig. 84.—Greenets Expandiiig Bullet. Sir Joseph Whitworth, having been invited by the British, militaryauthorities to institute experiments with a view to producing the best typeof rifle, with the help of the most perfect machinery, constructed thebarrels with a polygonal bore, a plan which he had…
Inventions
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