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Show ' '. i According to rent invefltigatioi.B ofUpUin Hi-ro, of Vienna it appears ap-pears that a specimen ol dynam.to mide in 1671 lost in five yeara I per cent of its nitroglycerin, and auotbtr sample maiuifActured in 0&t " four years 1.52 per cent, through I evaporation. The conclusions are that regular limes should bo fixed as limit for the employment of dynaniHe Bupplite, and that, when the ma ena ! iskeut bryond thre periods, it should j be replaced by fresh. It is also tug-I tug-I geetcd that, to allow for thia low, a larger proportion o! nitroglycerin i than the percentage now employed I ranging from 71 to 73) should bo in-j in-j trr-ducfcd in dynamite. Scientific American. |