_Power Conveyor._--Circular motion is converted into reciprocal motion to operate a pump at a distance from the engine. The short jack crank oscillates the driving pulley to move the conveyor wires back and forth. The distance to which power may be carried is limited by the expansion and contraction of the conveying wires. Wooden rods are better under extremes of temperature. Where an engine is used night and morning in the dairy house to run a cream separator, this kind of power transmission may be worked to operate the pump at the house. Light wire hangers will support the line wires or rods. They should be about three feet in length, made fast at top and bottom to prevent wear. The spring of a No. 10 wire three feet long is sufficient to swing the length of a pump stroke and the friction is practically nothing. ELECTRICITY ON THE FARM Electric current in some sections may be purchased from electric railways or city lighting plants. But the great majority of farms are beyond the reach of high tension transmission cables. In some places three or four farmers may club together and buy a small lighting plant to supply their own premises with both light and power. Unless an engineer is employed to run it trouble is sure to follow, because one family does all of the work and others share equally in the benefits. The solution is for each farmer to install a small plant of his own. The proposition is not so difficult as it sounds. Two-horsepower plants are manufactured for this very purpose. But there is more to it than buying a dynamo and a few lamp bulbs. A farm electric system should supply power to run all of the light stationary machinery about the farm, and that means storage batteries, and the use of one or more small electric motors. There are several ways to arrange the plant, but to save confusion it is better to study first the storage battery plan and to start with an engine large enough to pump water and run the dynamo at the same time. It is a good way to do two jobs at once--you store water enough in the supply tank to last twenty-four or forty-eight hours, and at the same time you store up sufficient electricity to run the cream-separator for a week. Electric power is the only power that is steady enough to get all of the cream. [Illustration: Figure 129.--Electric Power Plant. A practical farm generator and storage battery, making a complete farm electric plant that will develop and store electricity for instant use in any or all of the farm buildings.]