THE GATE-HOUSE AT WASHINGTON.
The illustrations accompanying this article show the gate-house at the aqueduct, Washington, D. C., constructed from plans by Colonel A. M. Miller, engineer of waterworks in that city. The exterior of the structure is very handsome and quite in keeping with the general work carried out in the improvement of the plant, The interior shows the arrangement of gate standards operating the sluicevalves. These valves were especially designed by the Coffin Valve company, of Boston. Regarding the eight-inch by twelve-inch roller-bearing sluicevalve: This is an entirely new method of constructing large size sluice-valves. By means of the roller-bearings, as shown in the illustration, very large gates are easily controled under heavy pressures. This arrangement, in combination with the ball-hearing gate-stand, is rapidly superseding the old method of installation, which in most cases was rendered impracticable by the immense friction on the faces of the valve. This valve company’s type of late is being constantly supplied to power plants, reservoirs, and other conditions requiring valves of large size, which must be frequently operated under unfavorable conditions.