The Mechanical Handling and Storing of Material

7io THE MECHANICAL HANDLING OF MATERIAL to the cylinder a, and pull down the handle B, whereupon the sack is automatically filled with the correct weight. It can then be tied up and another one attached. This portable weighing machine should be of great service under silo floors, where grain from different silos has to be filled into sacks, as it can be put in position under any silo, and connected by a sleeve or temporary spout with the hopper bottom. It is also made for suspending under the silos. Avery’s Automatic Grain Scale.—This automatic weigher is built by W. &T. Avery, Ltd., Birmingham, England. The diagrams, Figs. 1015 and 1016, show the scale when empty. Ax and a2 are the side frames in which are fixed the main bearings a5 and a6 ; in these rest the knife edges of the beam b having suspended at one end the iron box D, at the other end the receptacle c in which the grain is weighed, and so arranged that the box d exactly balances the hopper c. The former is constructed to hold the required quantity of dead weights, and being made with a sloping top, no dust, etc., can lodge thereon. It also has a hinged lid which can be fitted with a lock to prevent any tampering with the weights. The weigh hopper c has a door c7 at the bottom, which is automatically opened and closed when required. The supply of grain is regulated from the shoot f by a weighted valve G hinged at gt with an aperture g3 in its front edge. A pin g2 attached to the valve G works in the slot h3 of the lever h2 so that when the locking levers and h2 are down (as shown in Fig. 1016) the valve G is prevented from opening. These locking levers and h2 are connected with the lever l by a weighty rod k fitted with a steel roller Ku which, when the rod is raised, rests on the knife edges or roller m-j fastened to the trigger M, the latter being so pivoted as to swing underneath by its own weight. The door c7, at the bottom of the weigh hopper c, is kept shut during the weighing operation by the bar c3 attached to the toggle c6. This toggle is pivoted to the hopper, and fitted with a striking bolt cs, which, when the scale is required to weigh