tion shops and factories cannot fail to meet with general appre- mining powder. Ordinary powder explodes under the shock with any other known explosives. They are possessed ciation, while it will be particularly welcome to the of an iron weight of six kilogrammes falling from a height of peculiar… … Kg. l.-TUEPIN'S PEKCUSSION APPABATUS FOR EXPEKIMENTmG Mr. Turpin has been led to devise a portable ap- contains many entries now admitted free. Among UPON EXPLOSIVES. paratus for optical telegraphy at night, in which the manufactured articles is sugar of not above this material is used as an…
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