136 



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 



