DRIVEN MACHINES 133 







pair of horses with a grappling hook will remove the 

 separated roots. 



Dynamite often is used to blow stumps to pieces, and 

 the work is not considered dangerous since the inven- 

 tion of safety devices. In some sections of the country 

 where firewood is valuable, dynamite has the advantage 



Initial Position Final Position 



Figure 130. The Oldest Farm Hoist. The first invention for ele- 

 vating a heavy object was a tripod made of three poles tied together 

 at the top with thongs of bark or rawhide. When hunters were 

 lucky enough to kill a bear, the tripod elevator was erected over the 

 carcass with the lower ends of the poles spread well apart to lower 

 the apex. The gambrel was inserted under the hamstrings and at- 

 tached to the top of the tripod. As the skinning of the animal pro- 

 ceeded the feet of the tripod were moved closer together. By the 

 time the head was cut off the carcass would swing clear. 



of saving the wood. An expert with dynamite will 

 blow a stump to pieces so thoroughly that the differ- 

 ent parts are easily worked into stove lengths. Pitch- 

 pine stumps have a chemical value that was not sus- 

 pected until some fellows got rich by operating a retort. 



FARM ELEVATING MACHINERY 



Many handy and a few heavy elevators are being 

 manufactured to replace human muscle. The simple 

 tripod beef gin was familiar to the early settlers and 



