182 MECHANICS. 



*7th. By extending the track four feet beyond t'lie end 

 of the building, hay can be elevated and carried into 

 long, low hovels, or cow barns, when no other arrange- 

 ment would work at all. 



The car is small, and the track light and simple ; a 

 weight has been lifted of 1,080 pounds by it at one time, 

 with a i^air of mules." 



By using a strong car, it may be employed for unload- 

 ing coal from a boat. 



BuiLDixG Stacks. Three long poles may be used for 

 this purpose, securely chained at the top, and spread in 

 the form of a tripod. The one to which the lower pulley 

 is attached should be set firmly into the ground, to pre- 

 vent displacement by the outward draught. Holes are 

 bored into the poles at convenient distances, and cross 

 Fi'^. 206. pieces secured to them, for holding 



the board slide, and permitting it 

 to be gradually raised, as the stack 

 goes up. The hay may be pitched 

 from the ground as well as from a 

 load, without inconvenience, to any 

 height. 



Instead of chaining the poles to- 

 gether, they may be firmly secured 

 by using two stout clevises, the 

 bolts of which are passed through 



Mode of coupling the Poles. ^ j^^j ^^^^, ^^^ ^^^^ 



of the poles, (fig. 206). 



Palmer's Hay Stacker, represented in fig. 207, has 

 been much used at the West, where large quantities of 

 hay are deposited out of doors. It first elevates the hay, 

 and then swings it around over the stack, dropping it 

 where desired. It does not drag the hay against the 

 side of the stack, requires no staking down to prevent 

 tipping, and is easily drawn on the sills as runners, to any 

 part of the farm. The horizontal motion of the crane is 



