About the same time he came to Boston, Roper invented his Handstitch Sewing Machine.[1] In 1861 he invented a hot air engine. Roper worked for the Springfield Armory during the Civil War. Roper's work eventually came to the attention of other inventors and engineers of the area, including Elias Howe, Alvan Clark, Christopher Miner Spencer. Roper was observed driving his steam carriage around Boston in 1863. One such 1863 carriage went to the Henry Ford Museum.
Roper invented the first shotgun choke, short tubes that could be threaded onto, or removed from, the outside of the shotgun barrel to vary the shot spread to suit different targets and ranges. Roper and Christopher Miner Spencer were granted a joint patent for a repeating shotgun mechanism on 4 April 1882. Later, on 21 April 1885, Roper alone obtained a patent for an improved shotgun loading mechanism. Roper and his son, Charles, designed a factory producing screw making equipment, which Charles Roper continued to manage after his father's death.
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@2cv:Op maandag 28 juni 2010 17:17 schreef Paladijn het volgende:Met de hoeveelheid onzin die je verkondigd is het geen wonder dat je geen PTA-mod meer bent
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vorige deeltjes, statistieken, wie post er het meest enz enz
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