GENERATING MECHANICAL POWER 



85 



other end of the walking-beam is operated by a pit- 

 man shaft connecting with a crank wrist pin near the 

 ground. A round iron shaft similar to a horse-power 

 tumbling rod about ten or twelve feet in length and 

 one and a half inches in diameter is used to convey 

 power and motion to the pitman shaft. 



OETAIL"A" 



Figure 108. Mule Pump. A practical home-made power to pump 

 water for live-stock. It is used where the water-table is within 

 20 feet of the surface of the ground. The drawing shows a post 

 in the center which supports the walking-beam and acts as a fulcrum. 

 A mowing-machine wheel is keyed to one end of a round iron shaft. 

 The other end of this shaft turns in a boxing which is swiveled to a 

 short post as shown at B. See also detail "B.". The two plunger 

 shafts are shown at A A. The mule is hitched to the round iron 

 shaft near the traveling wheel by means of a round hook. As the 

 mule walks around in a circle the shaft revolves and operates the 

 crank B. There are side guys not shown in the drawing to keep the 

 walking-beam in position. 



A mowing-machine wheel is keyed to the outer end 

 of the tumbling rod. At the crank end is a babbitted 

 boxing with a bolt attachment reaching down into the 

 top of a short post set solidly into the ground, directly 

 under the inner end of the walking-beam. This bolt 

 permits the boxing to revolve with a swivel motion. 

 Another swivel connects the upper end of the pitman 

 shaft with the walking-beam. The whiffletree is at- 

 tached to the tumbling rod by an iron hook. This hook 

 is held in place by two iron collars fastened to the 



