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166 QUEENSLAND AGRICULTURAL JOURNAL. {1 Sepr., 1902. 
top, the openings thus made forming outlets for the different silos. The grain 
belts run along these tunnels, one to each tunnel. The spouts are of English 
make, and are the same as those shown in Fig. 27. These spouts are kept 
locked, and the keys remain at the head office, being given out to assistants 
only when grain is to be delivered. The assistant receives his directions in the 
brief form, ‘“‘ Deliver 100 tons from No. 67.” (See Figs. 25, 26, and 27). 
Brick elevators, put up by incompetent engineers, have sometimes 
collapsed; no one but the thoroughly competent and experienced engineer 
should be allowed to plan or erect elevators of this kind. 
Fig. 25.—Delivering machinery in a large English elevator. 1. Main grain belt arranged 
on a grade of one inten. 2. Spout which takes delivery of grain from the belt, 1, and guides it 
to the silo, as shown in Fig. 26. 3 and 4. Other similar spouts. 
The Société Anonyme des Magazins d’Anvers owns a large brick elevator 
at Antwerp, of an estimated capacity of 1,000,000 bushels. This elevator 
delivers bagged wheat for the most part, but is prepared to deliver in bulk. 
Grain cars of the American pattern stand ready to carry this latter. 
Pneumatic Elevators. 
Grain can be elevated by suction. If a tube through which air is being 
pumped is lowered over grain, so that the mouth of the tube, at which the air 
1s entering, comes near the surface of the grain, this latter will be drawn up 
into the tube and carried along with the air; or, to state the same thing in a 
different way, if grain or similar material be forced into a tube along with air, 
by means of a fan, it will pass along the tube with the air, so long as the 
velocity of the air is maintained at a certain rate which is within the reach of 
ordinary machinery. 
This fact has been utilised in a number of ways. Elevators have been 
constructed on this principle, as have also ensilage carriers. The system. 
