Fig. 17.—Ancient.
Fig. 18.—Modern.
Fig. 19.—Typical Grain-Handling Plant; 50 Tons per hour.
B is a length of flexible pipe to enable the nozzle to sweep the width of the barge, the length being dealt with by moving the boat to within the radius of the swivel arm E.
C is a permanent pipe carried on the jib arm which is mounted on a swivel joint; B is another short flexible pipe to permit of the swivelling already mentioned.
F indicates the receiver into which the grain is deposited, and G the special rotary valves, for releasing the material from the system without interfering with the vacuum of the conveying line.
H illustrates the twin air filters which are provided with valves, so that each of the filters can be isolated in turn from the rest of the plant for cleaning of the fabric tubes, without interrupting the continuous working of the plant.