PERFECTING THE DETAILS. 201 



excepting n, and every one of the long line of sieves 

 supposed to be attached is slightly jarred, and then the 

 spring makes a move, forcing the whole line of sieves 

 back again. You can drop grain one hundred times for 

 each charging, and only a spoonful each time. 



Pipe, sieves, operating wire, pulleys, cord, spring, 

 concussion plate, h, hammer, etc., combine to effect the 

 same purpose as is indicated by the wire, weight, spools 

 and long pipe with cylinders in Figs. 82 and 84. The 

 feed shelf serves the same purpose as the sieves and the 

 cylinders heretofore described, except that it is not as 

 accurate in distributing feed. The shelf has this advan- 

 tage, it is not necessary to use grain of different sizes, 

 as is indispensable when the cylinder is employed. 



When you strike at one end of a wooden shelf or beam 

 several hundred feet long, the jar is felt in some degree 

 throughout its entire length, but is weakest by consid- 

 erable at the point most distant from the hammer. In 

 order, therefore, to transmit the shock better, fasten an 

 iron pipe, rod or bar to the boards. In Fig. Ill, e rep- 

 resents such a bar fastened to the board, a. The con- 

 cussion plate, ^, receives the blow. The board, a, in 

 Fig. 17, Page 55, is supposed to be a continuation of 

 the board, a, in Fig. 111. After a blow and a swing 

 forward, the whole long shelf swings back towards the 

 hammer, and meeting the stopper, ?', it remains at rest 

 awaiting another whack. The simplicity of the employ- 

 ment of the force of gravit5 to effect the return to 

 place, instead of the use of ;i spring, commends this 

 style of feed dropper, and besides, tin and wire mesh 

 are needed for feed cylinders and sieves, but not for 

 feed shelves One stroke with the hammer is enough 

 for that time 



To keep the shelf in place, fasten two casters to the 

 board, /, these boards, with the end pieces, being 

 attached to some part of the building or to the frame 



