FIG. 135.-Sectional View of Front Wheel of Hart-Parr Three Wheel Tractor Showing Method of Supporting Steering Member. the front end being utilized for steering. A frame of this pattern is shown at Fig. 134, the wheel being operated through the usual form of steering wheel by means of reduction gearing and a drag link. The method of supporting a single front steering wheel is clearly shown at Fig. 135. The wheel has a large hub which is provided with a bearing surface on its inner periphery which runs on two bronze bushings carried by the steering knuckle. The wheel is supported by a cross member which is attached to a bearing in which the steering knuckle pivot pin is fastened. A steering arm is attached to the wheel core and moves the wheel to the angle desired for steering. Automatic Steering Arrangement.-In many cases it is desirable to provide means so that a tractor and plough outfit can be operated by one man without difficulty. This may be done in two ways. Either the steering or the operation of the machinery the tractor is hauling must be automatically arranged. In ploughing with the lever actuated types of engine ploughs the engine operator can attend to these if long furrows are being ploughed without difficulty if an automatic steering arrangement is used. A typical construction when applied to a tractor having a centrally pivoted one-piece axle is shown at Fig. 136, while another form, which is suitable for use when a front axle of the Ackerman type is utilized, is depicted at Fig. 136-A. The operation of these devices is not difficult to understand. As usually constructed a wheel is carried by a frame extending from the front axle which drops into the last furrow cut. If the furrow is moderately straight, this wheel will keep the tractor axle in proper position so that it can follow any slight deviations from a true course made in cutting the last furrow without any attention from the operator. At Fig. 136 it will be apparent that when a front wheel is carried at the extremity or apex of the triangular support joining it to the axle, which forms the base, any movement of the wheel will be transferred back to the front axle. An arrow carried at the end of a standard so that it can be conveniently glanced at by the operator from time to time serves as a direction indicator and a guide by which the course of the tractor or any deviation from a correct line of travel will be FIG. 136A.-The Cuddy Automatic Steering Device Applied to Ackerman Type Front Axle. readily ascertained. In the device shown at Fig. 136-A the action is somewhat similar to that previously described, except that two wheels are used and a system of leverage is employed to change the direction of |