Tractors
the name applied to motor vehicles employed as drawing power and is thus to be distinguished from vehicles used for carrying. The "tanks" that played such a notable part in the World War were developed by adapting to them a principle already in use on the larger farm tractors-the caterpillar wheel tread. This enabled them to drive over obstacles, rough ground and trenches and gave great drawing power. Of necessity, the engine employed in tractors must be more than ordinarily powerful.
The perfection of a comparatively cheap tractor by Henry Ford, and its manufacture on a large scale, has placed it in wide use. It is employed largely in agricultural work where tractors perform all the heavy drawing tasks from plowing the ground to reaping the product. It is widely used also in indusheavy loads is necessary. Indeed, the application of the tractor is practically limitless and its use adds infinitely to the efficiency of industry of all kinds, where the drawing of heavy loads is a necessity. must be secured by a piece of tape round the neck, and the edges of the wound above and below the canula may be trial plants where the transportation of brought together by stiches or by adhesive plaster.