making a total of $28, which is less than $2.50 per month for the work of elevating a constant supply of water for the house, stable and barnyard. ONE-MULE PUMP A home-made device that is much used on live-stock ranches in California is shown in the illustration. This simple mechanism is a practical means for converting circular mule motion into vertical reciprocating pump action. A solid post is set rather deep in the ground about twelve feet from the well. This post is the fulcrum support of the walking-beam. One end of the walking-beam reaches to the center line of the well, where it connects with the pump shaft. The other end of the walking-beam is operated by a pitman shaft connecting with a crank wrist pin near the ground. A round iron shaft similar to a horsepower 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. [Illustration: 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 attached to the tumbling rod by an iron hook. This hook is held in place by two iron collars fastened to the tumbling rod by means of keys or set-screws. The mowing-machine drive wheel travels around in a circle behind the mule turning the shaft which works the walking-beam and operates the pump. It would be difficult to design another horse or mule power so cheap and simple and effective. The mule grows wise after a while, so it is necessary to use a blindfold, or he will soldier on the job. With a little encouragement from a whip occasionally a mule will walk around and around for hours pulling the mowing-machine wheel after him. HORSEPOWER One horsepower is a force sufficient to lift 33,000 pounds one foot high in one minute.