Excerpt from Automobile Engineering, Vol. 6 of 6: A General Reference Work for Repair Men, Chauffeurs, and Owners

Types of Tractors. Regarded from the mechanical standpoint, the large number of machines now being built may be classified in groups according to some feature of design, such as the type of motor employed, the method of transmitting the power, the man ner of securing traction, and the number of wheels, where the lat ter are used. For example, when classified according to type of motor, there would be a group consisting of those tractors using a slow-speed two-cylinder engine adapted from stationary-engine practice, and a second group of those employing a high-speed four or six-cylinder motor designed along lines that have been made familiar on the automobile. -when classified according to trans mission of power, the tractors using a drive through a clutch, which are in the majority, would fall in one group and those employing a friction type of drive in another. On the basis of the method of obtaining traction we would have a group consisting of tractors employing wheels, also in the majority, and a group com posed of the so-called caterpillar, or tracklaying, type and its numerous modifications. A subdivision of the class using wheels can be made to cover three and four-wheel types since many machines differ chiefly in this respect. As a matter of fact, sub divisions oi practically every one of these classes are possible. For instance, in some three-wheel machines there are two driving wheels, while in others but one is employed. These numerous differences are cited merely to point out the great range of varia tion that exists.

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