Steam:
Its Generation and Use

surface and increases the losses from that cause.< The proportions of this boiler have been adopted after numerous experiments with boilers of vary- ing capacity ; and experience has established that this boiler can be driven to the utmost, carrying a steady water level, and steam pressure, and always furnishing dry steam. The cubical capacity of this boiler, per horse- power, is equal to that of the best practice in tubular boilers of the ordinary construction. The fire surface being of the most effective character, joints, opposite each end of each tube, permit ac- cess thereto for cleaning, and a man-hole in the steam and water drum, and hand-holes in mud- drum are provided for the same purpose. All portions of both the exterior and interior surface are fully accessible for cleaning. The occasional use of steam through a blowing pipe attached to a rubber hose operated through doors in the side walls, will keep the tubes free from soot and in condition to receive the heat to the best ad- vantage. FRONT VIEW. VERTICAL SECTION. Babcock & Wilcox Boiler, at T. A. Edison’s Laboratory, Menlo Park, N. J, 75 H, P. Erected 1878. Showing style of Fronts for single boilers. these boilers will, with good fuel and a reason- ably economical engine, greatly exceed their rated power, though it is seldom economy to work a boiler above its nominal power. The space occupied by this boiler and setting is equal to about two-thirds that of the same power in tubular boilers 13 —Accessibility for Cleaning. This is of the greatest importance and is secured to the fullest extent. Hand-holes, with metal 14.—Least Loss of Effect from Dust. WATER-TUBE. The ordinary fire tube, or flue, receiving the dust from the fire on the in- terior is quickly covered from one-third to one- half its surface, and in time is completely filled. FIRE-TUBE. The water-tube, however, will retain but a limited quantity on its upper side, after which it becomes in a measure self-cleaning. 41