172 " JIECHANICS. 



jecting both ways, like those of a common revolver ; a 

 horse is attached to each end, and a boy rides each horse. 

 A horse passes along each side of the windrow, and the two 



Fifr. 191. 



Hay-sweep in Operation. 

 thus draw this rake after them, scooping up the hay as 

 they go. When 500 pounds or more are collected, they 

 draw it at once to the stack, or barn, and the horses turn- 

 ing about at each end, causing the gates to make half a 

 circle, draw the teeth backward from the heap of hay, 

 and go empty for another load the teeth on opposite 

 sides being thus used alternately. To j)itcli easily, the 

 back of each load must be left so as to be pitched first. 



The dimensions should be about as follows : Main 

 scantling, below, 4 by 5 inches, 10 feet long ; the one 

 above it, same length, 3 by 4 inches ; these are three feet 

 apart, connected by seven upright bars, 1 by 2 inches, and 3 

 feet long. The teeth are flat, 1^ by 4 inches, 5 feet long, 

 or projecting 2^ feet each way ; they arc made tapering 

 to the ends, so as to run easily under the windrow. A 

 gate, swinging half way round on very stout hinges, is 

 hung to each end of this rake, and to these gates the 

 horses are attached. Each gate consists of two pieces of 

 scantling, 3 inches square, and 3 feet long, united by two 

 bars of wood, 1 by 2 inches, and a third, at the bottom, 3 

 inches square, and tapering uj) wards, like a sled runner ; 



