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��Popular Science Monthly
��l"x'/8 Iron strap
��BraKe pedal Foot board
���General plans for the frame and bob sleds, and the location of the engine, tank, levers, steering column, seat and propeller wheel. The dimensions may- be changed to suit the needs of the individual builder, but these are right for general uses
��all nuts which bear directly on the wood. Put on the foot board and fill in between it and the piece C with matched boards. The steering column is now put in place. This is shown in detail in Fig. 3 and 4. The two tapered blocks J are made from a piece of the 2 by 4-in. material and bolted to the platform with 3^-in. bolts. The bushing is made of 1-in. pipe with a flange coupling screwed on each end. The collars are also made of 1-in. pipe. They are fastened by drilling through the steering column and using y^m. rivets. The arm K is fastened on by making a slot in it 1 in. long and y2 in. wide. The end of the rod is filed to fit the slot. When in place the rod end is riveted. The rod L is connected with the runner by a small angle iron similar to those used for the steering rods. The rod is hammered out to a diameter of y^ in. at the end and formed into an eye which is left partly open. The angle iron for connecting it to the runner is put on one end and the eye closed. The other end is then put
��through the hole in K and the angle iron bolted to the runner. The manner in which the steering wheel is fastened de- pends upon the type of wheel used, and therefore no directions can be given.
The seat may next be made. It is 6 in. high with a back 15 in. high, the boards being cleated together. The driv- ing wheel bracket, crank and connecting link are shown in Fig. 5, 6 and 7. The width of the bracket and the width of the axle slot depend upon the wheel obtainable. The traction band for the wheel is shown in Fig. 8. This is made of 13^ by 3 8"^n. iron, with small angles of the same iron riveted to it with the 34-in. rivets. Be sure it fits the wheel tightly. Do not forget to have the chain in place before putting the wheel in the bracket. The rod N is held in place with cotter pins. Short pieces of pipe are represented by P.
The lever details and the rack are shown in Fig. 9 and 10. The rod con- necting the lever with the crank is J^ in. in diameter. Make it the right length
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