A Treatise On The Principles And Practice Of Dock Engineering

540 DOCK ENGINEERING. tubes nécessitâtes attention, but not to the same extent. No matter how tortuous the route, the grain can be sucked out of bunkers and other con- fined spaces, which would be otherwise inaccessible. Furthermore, there is much less exposure to the weather, and pneumatic elevators can be worked under almost any atmospheric conditions. Figs. 560 and 561. —Pneumatic Grain Apparatus. The Millwall apparatus,* illustrated in figs. 560 and 561, is located in a hull about 80 feet long by 24 feet wide by 10 feet deep. It is driven by a compound engine connected direct with air-exhausting pumps, capable nf producing and maintaining a partial vacuum of 15 inches of mercury, in a tank into which some 5,000 feet of air, under atmospheric conditions, is being admitted per minute. The tank, which acts as a grain-receiver, is * Duckham on “Pneumatic Machinery for Loading and Discharging Grain Cargoes,” The Engineer, April 8, 1898.