There are five kinds of grain powder used in the U. S. service, distinguished as mammoth, cannon, mortar, musket, and rifle powder, all made in the same manner, of the same proportion of materials, and differing only in the size of the grain. Mammoth is employed for the heaviest sea-coast guns; cannon for smaller sea-coast guns; mortar for mortars and field- and siege-pieces; musket for rifle-muskets; and rifle for pistols. In addition to the above we have the following:
Meal powder, a fine dust containing the ingredients of ordinary gunpowder, but in which the relative proportions of these ingredients vary, according to the rate of burning desired, and the object for which the powder is to be used. Used principally in pyrotechny, and in mortar fire to communicate the flame from the charge to the shell. Also “German” or “American” “White Gunpowder,” more powerful than ordinary gunpowder, but more expensive; acts upon iron, and is very little used in gunnery.
Pebble powder, an irregular large-grain powder, very similar to American “Mammoth,” which preceded it, was made in England, 1865, by breaking ordinary [press-cake] with copper hammers.
Fossano powder, made in Italy, 1871, granulated by hand, is a slow-burning powder, used in large guns, notably in the 100-ton guns, one of which was recently burst, 1880, by a charge of 552 pounds of this powder. Lately the grains of this powder have been given a regular form.
Among regular grain powders made without molding are cubical, an English powder, extensively used in all their large guns, the largest being 2 inches on the edge. This is made by passing the cake between fluted rollers, which cut it into strips, and then these strips endways between a second set of rollers.
Schaghticoke, made at Hart’s Falls, N. Y., is a cubical powder made very much like the English,—the lines of fracture are, however, simply scratched on the cake (both sides), which is afterwards broken in the ordinary way.
Molded Powder.—The ingredients are the same as those of ordinary gunpowder, but each grain is separately molded.
Gen. Rodman was the first to propose the manufacture of these powders in his perforated cake, 1860; the object being to cause the powder to burn on an increasing surface, thus lessening the strain on the gun in the first moments of combustion. His powder after a few experiments was allowed to fall into disuse in the United States, but the invention was carried to Europe and developed with a smaller grain into prismatic powder, used in Europe, and especially in Germany and Russia, and particularly adapted to breech-loading cannon; the grain is a hexagonal prism in form and contains six cylindrical orifices passing entirely through it parallel to the axis, and symmetrically arranged with respect to it. The cartridge is so made that the cylindrical orifices pass through the entire length.
Hexagonal Powder.—This is the powder principally used in the United States; the grains have the shape which would be given by joining the larger bases of two frustrums of equal six-sided pyramids, and vary in size according to the piece in which the powder is to be used. This powder is believed in the United States to give the best results, and can be adapted to cannon of any caliber.
History of Gunpowder.—The origin of gunpowder as an explosive, and its application to the projection of missiles of war, are lost in the mists of obscurity. Its use in Europe can be traced only to the middle or early part of the 14th century. It is believed by many that certain experiments by Schwartz, a German monk, led to its introduction in war, but the better theory seems to be that the knowledge was obtained from the Saracens. It is probable that the invention arose in Central Asia in the regions where saltpetre occurs as an effervescence of the soil. The Chinese appropriated the discovery at a very early period, and fireworks were common in that country when Europe was roamed by the primitive savage. When Ghengis Khan invaded China, B.C. 1219, fire-arms of a primitive form appear to have been used. Passages in old writers seem also to show that when Alexander invaded India, 327 B.C., he encountered tribes that used similar weapons. The people of India doubtless obtained their knowledge from China. Wars and migrations of tribes gradually disseminated a knowledge of gunpowder over Asia and Northern Africa. The use of gunpowder is mentioned in Arabic writings in the 13th century. The Moors used it in Spain in 1312. In 1331 the king of Granada employed it in sieges. It is said to have been used by the English in the battles of Crécy, 1316. The Venetians employed it in 1380 against the Genoese. From that time to the present fire-arms have gradually supplanted other weapons.