ScientificAmerican1875-10-16.jpg Scientific American 1875-10-09ThumbnailsScientific American 1875-10-23Scientific American 1875-10-09ThumbnailsScientific American 1875-10-23Scientific American 1875-10-09ThumbnailsScientific American 1875-10-23Scientific American 1875-10-09ThumbnailsScientific American 1875-10-23Scientific American 1875-10-09ThumbnailsScientific American 1875-10-23

Boring the trunnion coil of an eighty-tun gun; the Fraser system of ordnance, currently in use in England for all sizes of artillery.