| http://www.w3.org/ns/prov#value | - uth. ???The attachment of knives to cannon balls in such manner as to be closed when the ball is placed in the gun, and thrown out when the ball is discharged??? (actually an old notion) or an ???arrangement of reflectors and lenses which would send a focus of light and heat two or three miles???so that it would set objects on fire with the same facility as an ordinary sunglass,??? were but two su
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