[THE MANUFACTURE OF GUNPOWDER.]
BY FRANKLIN MATTHEWS.
here would be no sense in having powerful war-ships, enormous cannons, and hard, tough projectiles to use in them, if we did not have improved powder to make them all effective. The high-grade powder used in warfare in these days is known in this country as "brown powder," because of its color. In Europe such powder has a dozen or more names, generally called after the men who have invented each kind. There are only two places in this country where the powder used in our big guns is made. One of them is the works of the E. I. Du Pont de Nemours & Company's plant on the Brandywine Creek, near Wilmington, Delaware, and the other is the works of the California Powder Company, near Santa Cruz, California. In both of these places the process is secret, and no one except those employed about the works is supposed to know exactly how "brown powder" is made.
All powder, whether it is intended for blasting, hunting, rifle-shooting, or warfare purposes, is made in the same general way, and so, in telling of a visit I recently made to the Du Pont Works, near Wilmington, I shall reveal no secrets if I describe the various mills and processes which practically all powder goes through before it is finished. Ordinary powder is composed of three ingredients—saltpetre, sulphur, and charcoal, or nitrate of soda, sulphur, and charcoal. Powder intended for blasting is generally made with soda; powder intended for shooting is generally made with saltpetre. It takes a great deal more than these ingredients, however, to make powder. There must be a lot of small buildings, generally scattered about a ravine, through which a stream runs to furnish power to the mills. These mills are for the most part small, one-story structures, that look at first glance like tumble-down affairs, out in the woods. Closer examination shows that they are built for the most part of stone on three sides and wood on the fourth, and that they all have light wooden roofs. Still closer examination reveals that the floors are laid with big wooden pegs instead of nails, and that so far as possible all the machinery they contain is made of wood. All the shovels and other implements used by the workmen are of wood, and every man about the place wears shoes with wooden-pegged soles instead of shoes which have nails. Fancy these conditions in a beautiful wooded park, running for three miles along the picturesque Brandywine Creek, near Wilmington, and you can imagine something of the attractive external appearance of the Du Pont Works.
There is good reason for the use of wood instead of metal in the thirty or forty buildings which make up this plant. You may not know it, but, it is said to be a fact that there must be a spark to ignite powder. You may take a live coal, for example, and drop it into a dish of powder, and the result will be that the powder will simply burn rapidly. Strike a spark and let it come in contact with the powder, and there is an explosion. All powder-mill explosions, with their dreadful losses of life, are caused by sparks. It is to avoid sparks that wooden-pegged floors and shoes are required in the mills, and that wooden shovels and machinery are used. You can see how dangerous metal is about a powder-making plant when your guide takes a bunch of keys from his pocket to unlock a mill where the work is done for the day. He inserts the key in the padlock as slowly and as gently as if he were performing a most delicate surgical operation, one where life is at stake by the mere turn of the wrist. He turns the bolt as carefully as if the lock were made of an egg-shell, which he didn't want to break. Your life and his really are at stake, and neither he nor you can exercise too much care.
THE CHARCOAL-MILL.
There are two distinct stages in powder-making. The one is the part that is not dangerous of itself, and the other is the part that is dangerous—so dangerous, in fact, that the life of no one engaged in the work is safe. Still, so thorough are the precautions taken that the percentage of loss of life at this work is really very small, and one sees about the Du Pont Works men who have been employed there for thirty and forty years. The part of the manufacture that is not dangerous consists of the preparation of the ingredients that compose the powder. In one of these mills the charcoal is made. For the higher grades of powder only willow wood is used in making the charcoal. For blasting-powder almost any wood of good grain is used. The willow is grown largely on the grounds of the beautiful park, and the smaller limbs of trees are taken. Willow has an especially fine grain and texture, and this makes it valuable for powder manufacture.