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Scientific American, Vol. 8, No. 2 (January 1863) (1863)

leaf 7

An illustration from Scientific American, Vol. 8, No. 2 (January 1863), 1863, leaf 7
hout any apparent evil effect on of powder, as previously stated. The object claimed of no small nyllgnitude, as it prevents the formation the gun ; using shot of various sizes and weight, to be gained is that which has long baffled the world of the necessary vacuum. The accompanying en- from 40 to… … device ■would have escaped him. Patented August 9, 1862, by SHAW'S AIR VALVE 10E PUMPS. From the day of the discovery, Thomas Shaw. For further infor- without increasing the strain upon the gun. We 1841, down to the present time, Mr. Timby has been mation address Philip S. Justice & Co. 54 Cliff…

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