Explosives . 3). The general principle is, however, the granular powder i> put into a hopper and flows from there into a measurethat automatically measures IT the right quantity, which then passes into the die. The dies an- arranged in rows in a plate, bo that whilst one row is beingfilled another i> being pressed. The pressure i> usually applied simultaneously from above and below by twodifferent plungers. The cen-tral hole is formed by meansof a pin which passes throughthe lower plunger and intothe other. Hydraulicpressi -are safer, but mechanicalones more rapid in theiract
Explosives . 3). The general principle is, however, the granular powder i> put into a hopper and flows from there into a measurethat automatically measures IT the right quantity, which then passes into the die. The dies an- arranged in rows in a plate, bo that whilst one row is beingfilled another i> being pressed. The pressure i> usually applied simultaneously from above and below by twodifferent plungers. The cen-tral hole is formed by meansof a pin which passes throughthe lower plunger and intothe other. Hydraulicpressi -are safer, but mechanicalones more rapid in theiraction. For blasting car-tridges, machines are alsomade with rotating tablescontaining a number of dies :each operation, rilling, j>ress-ing, removing, is performedat a different position of thetable. Such machines arequite automatic and requirevery little attention. Both black and brownpowders have been mouldedinto prisms which are usually25 mm. high and 40 , measured across thecomers of the :.. Mechanical Press for Moulded etc. (F. Krupp Grusonwerk) Powdei -.! The following Tabic gives the details of the E iglish and (ierman powders : < iountry Ml. ( harcoalBlack . Propirtions Density England Prism1 Black . 76 : 10 : L6 1-76 .. Prism1 Brown I •? ? »wn. 79 :: : 18 1-80 .. .. 77-4 : 5 : 17-6 1-80 ,, 79 : 3 : 18 1-85 m\- . Black . 74 : 10 : 16 1-66 75 . 71 : 10 : 16 1-76 .. 82 Brown. 7 s 3 19 1-80 ,, P.] .. BO 0 : 20 1-88 France J*. .. 7^ 3 : 19 1-85 1-87 Ohesneau, pp. 322, 341. MANUFACTURE OF GUNPOWDER 87 has seven holes, all the others. English and German, only one. Thevalue of the brown straw eharcoaUis that under the high pressures it flowsand holds the mixture together, making it into an impervious mass, whichcan only burn at the surface, whereas black powders have slight pores through BLACK BLASTING POWDERGRADED BLACK BLASTING POWDERMIXED GRAINS FFFF
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Keywords: ., bookcentury1900, bookdecade1910, bookidexp, booksubjectexplosives
