Explosives . an axle carrying eight low- ,,f fork-shaped arms. called tl\ i The drum rotates in one direction making 4<i revolutions per n inute. The axle moves in the other direction and make- 120 revolutions pn the Continent stamp-mi lis are -till used to a small extent for incorporat-ing a- well as mixing gunpowder. I n < Sermany the stamp-heads may be madeof copper, zinc, bronze or other suitable The charge iv placed in aspherical hole in a block i» i ially hard wood in-. 1 \t>iitiit it (In sin n a. ]i. 327. nfaUrtrhuitungt ten, 1912, i>. Fig. 6. Excelsior Mill, made by
Explosives . an axle carrying eight low- ,,f fork-shaped arms. called tl\ i The drum rotates in one direction making 4<i revolutions per n inute. The axle moves in the other direction and make- 120 revolutions pn the Continent stamp-mi lis are -till used to a small extent for incorporat-ing a- well as mixing gunpowder. I n < Sermany the stamp-heads may be madeof copper, zinc, bronze or other suitable The charge iv placed in aspherical hole in a block i» i ially hard wood in-. 1 \t>iitiit it (In sin n a. ]i. 327. nfaUrtrhuitungt ten, 1912, i>. Fig. 6. Excelsior Mill, made by Maschineabau ?? !.•<?!ii-< irinu MANUFACTURE OF GUNPOWDER 77 at the bottom for the stamp to play upon. The stamping is carried on forabout fourteen hours. If continued longer the density of the powder diminishes and the ballistics deteriorate. In France the use of stamp-mills was definitely abandoned in thepowders there being incorporated in drums and mills. The cheaper sorts ofpowder are incorporatedentirely in drums contain-ing wooden balls. InEngland also stamp-millsare not used, and thestandard method is togrind the ingredients to-gether in incorporatingmills. Formerly theseconsisted of two heavystone edge-runners work-ing on a stone it is more usual tohave iron runners work-ing on an iron bed-plate ;of course iron must notwork upon stone, or viceversa, on account of thedanger of genera ting-sparks. In the most usualtype of mill the runnersare G or 7 feet in diameterand about 15 inches wide,and weigh about 4 t
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Keywords: ., bookcentury1900, bookdecade1910, bookidexp, booksubjectexplosives
