Gas and Dust Gallery No. 1.—Gallery No. 1 is cylindrical in form, 100 ft. long, and has a minimum internal diameter of 6 1/3 ft. It consists of fifteen similar sections, each 6 2/3 ft. long and built up in in-and-out courses. The first three sections, those nearest the concrete head, are of 1/2-in. boiler-plate steel, the remaining twelve sections are of 3/8-in. boiler-plate steel, and have a tensile strength of, at least, 55,000 lb. per sq. in....
...The beam, from which the mortar is suspended, rests on concrete walls, 51 by 120 in. at the base and 139 in. high. On top of each wall is a 1-in. base-plate, 7 by 48 in., anchored to the wall by 5/8-in. bolts, 28 in. long....
This apparatus is in the southeast corner of Building No. 17. The cylinder is 31 1/2 in. long, 19 1/4 in. in diameter, and is anchored to a solid concrete footing at a convenient height for handling. The explosion chamber is 19 in. long and 7 7/8 in. in diameter, with a capacity of exactly 15 liters....
The inner receiver is made of 1/16-in. sheet copper, 30 7/8 in. deep, and with an inner diameter of 17 7/8 in. It is nickel-plated, and strengthened on the outside with bands of copper wire, and its capacity is about 70 liters....
...In the front of the box are two plate-glass observing windows, 2 5/8 by 5 1/2 in. In the side of the box, between the two windows, is a 3/8-in. hole, which can be closed by a tap-screw, through which samples for chemical analysis are drawn.
There is some variety in the cupboards and tables provided in the various laboratories, but, in general, they follow the design shown in [Fig. 13]. The table tops, 12 ft. long, are of clear maple in full-length pieces, 7/8 in. thick and 2 5/8 in. wide, laid on edge and drilled at 18-in. intervals for bolts. These pieces are glued and drawn together by the bolts, the heads of which are countersunk. The tops, planed off, sanded, and rounded, are supported on pipe legs and frames of 1 1/4 by 1 1/2-in. galvanized-iron pipe with screw flanges fitting to the floor and top. Under the tops are drawers and above them re-agent shelves. Halfway between the table top and the floor is a wire shelf of a frame-work of No. 2 wire interlaced with No. 12 weave of 5/8-in. square mesh.
...The fineness of the coals put through the hammer crusher varies somewhat, but the average, taken from a large number of samples, is as follows: Through 1/8-in. mesh, 100%; over 10-mesh, 31.43%; over 20-mesh, 24.29%; over 40-mesh, 22.86%; over 60-mesh, 10 per cent....