department, 2500 feet further up the canal. There was an intermediate building designed and used for several months, as the dusting and glazing department, the drying alone being done in the one above mentioned; afterwards the three processes were carried on together in one structure. It was soon perceived that the drying process, which was done by similar arrangements to those used at the government works at Waltham Abbey, England, that is, by placing the powder in small quantities in shallow trays in a frame work, over steam heated pipes, required considerable manual labor and occupied much time. It occurred to me that the same could be accomplished more speedily and with far less labor, by a single operation, which would likewise perform the glazing and dusting.

To accomplish this the powder from the granulating house was placed in revolving cylinders having hollow axles, and a current of air warmed by passing through an arrangement of steam pipes was blown through, carrying the dust into its receptacle, leaving the grains clear. This also dried and glazed them at the same time. Thus by one operation, by machinery, all three processes were accomplished, resulting in a large saving of labor and time. In addition, a beautiful jet black glazing was given by admitting a small quantity of steam at the proper time to the current of air, while the barrels revolved. This was not generally done, however, as it was regarded of but slight, if any, practical value, the usual glazing answering all required purposes.

Two hundred yards from this department was the boiler house supplying the steam required for the pipes used in the drying process. Its chimney was one hundred yards still further removed, communicating with the furnace by a subterranean arched flue; thus sparks would have had to drift over three hundred yards to reach the clean metal roof of the drying building.

The finished gunpowder was taken to the next building, one thousand five hundred feet beyond, up the canal, where it was weighed out and put into strong wood boxes about two and a half feet long, by one foot square, having the ends let into grooves; one of the ends had a strong wood screw, two inches diameter, with an octagonal head. Experience proved that these powder boxes, a devise of my own from necessity, were superior to barrels, being stronger, occupying less room, standing transportation better, and [p22] safer in use. No explosion ever occurred in their transportation, notwithstanding the occasional Railroad accidents, and the many thousands that were sent from the Powder Works during the war.

The powder boxes being filled, were then transported to the magazine, three quarters of a mile still further up the canal. This wood structure was on a rising ground one hundred yards from the canal, enclosed by a high fence. Its capacity was about one hundred tons of gunpowder.

At this, and every other separate building of the Powder Works, a sentinel was stationed day and night, and the utmost vigilance used. Also, each of the separate buildings along the canal, except the magazine, containing large amounts of gunpowder, were enclosed with high brick walls, having a single entrance.

At the Waltham Abbey Works, in England, the gunpowder cake after being crushed, is subjected to compression by the hydraulic press to give it sufficient density. I found that by using five ton rollers, the proper compression could be given in the powder mills during the incorporation, thus saving much labor and time. The hydraulic press, consequently was only used to compress the powder dust into thin cakes, which were sent to the granulating department to be used for fine grain powder only.

The press house was located between the Cooling Magazines and the granulating building on the same side of the canal as the former. It was a large brick structure provided with two hydraulic presses, cranes, and other appliances, with a turbine water wheel to supply the required motive power. After the discovery that the proper density could be better given to the powder cake, by using sufficiently heavy rollers during the incorporation, this department was used only for the purpose above stated.

The interval of ninety feet between the Refinery building and the Incorporating Mills, was mainly occupied by a fine building called the Laboratory. It had a projecting tower in the front centre, twenty-five feet square at the lower stories, which together were forty-five feet in elevation. From this the upper portion fifteen feet square ascended to the height of thirty feet, making seventy-five feet in all. The upper part of this constituted the clock tower with its four large circular openings for dials. These could be seen for a long distance.

This building which was very striking in its appearance, was [p23] never completed in its interior, as the different work to be here performed was being done at the Arsenal sufficiently well, in temporary structures. Awaiting the completion of the clock, the time was struck by hand, every half hour on the large bell suspended temporarily, in the open building in rear of the Refinery.

The continual testing of the powder, as it was being manufactured to insure its equality in strength, and to ascertain its exact propelling force, was done for the fine graded powders, by excellent musket and ballistic pendulums constructed at the Confederate Machine Works in Augusta under my direction. For the cannon or large grain powders, by the initial velocities given to the proper projectiles in an eight inch Columbiad. To determine these velocities an accurately made electro-ballistic machine, such as was employed at the West Point Military Academy, was constructed at the same works. Also Rodman’s apparatus for determining the absolute pressure on each square inch of the bore of the gun, exerted by the charge. In addition to these instruments, complete arrangements for determining the gravimetric densities and hygrometric properties of different samples of gunpowder were made.

The foregoing appliances enabled accurate comparisons to be made at all points between different gunpowders, and to determine the various matters required in the manufacture of the first quality for the various arms of service. That this was successfully done was certified to by Boards of Artillery and Infantry Officers; after the war the captured powder of these works was used in the School of Artillery practice at Fort Monroe, on account of its superiority.

Mr. Davis, whilst President of the Confederacy, visited the works, then in active operation, and in his recent valuable book, speaks in more than one place in flattering terms of their products. Articles published in the London Times were highly commendatory of the Works and their results, which were copied in Continental papers. They were visited by many distinguished civil and military gentlemen, both native and foreign.

The great extent of the Powder Works and their immense capabilities, were the admiration of all visitors. This was mainly due to the foresight of the President of the Confederacy, who, comprehending the requirements of a great war, then scarcely commenced, strongly drew my attention to the probable necessity of very large supplies of gunpowder to meet the service of artillery of great