9^28 



Popular Science Monthly 



tails of this block will be taken up in the 

 order of construction for setting the motor- 

 cycle. 



Rear Riiiniers 

 The rear runners are built independently 

 of each other and should l)e made of i^-in. 

 hardwood 44 in. long and 9 in. wide. Make 

 the top plalc II of i-in. hardwood 36 in. 

 long and 6 in. wide. These top-plates 

 should be secured to the runners in such 

 position that the outside edge extends about 

 2 in. beyond the outer face of the runner. 

 Care must be taken that this plate is di- 

 rectly at right angles to the runner. 

 Put a triangular brace directly under the 

 supporting tube as shown in the dotted 

 lines in Fig. 3. As these runners must ha\-e 

 a free movement to pass over obstructions 

 they are not attached directly to the frame 

 but to the axle-tube I, Fig. i. The axle is 



In the center, for a distance of about 7 in. 

 use the full width of the piece, then cut 

 on an angle to 3 in. in width as shown in 

 Fig. 4. At a distance 20 in. from the front 

 end of each of the runners cut a notch 2|^ 

 in. wide and 2 in. deep to receive the ends 

 of the crossbar J, Fig. i. The top-plate of 

 the front runners is 2 in. wide and i in. 

 thick. As a part of the crossbar ends pro- 

 jects I in. above the top of the runner this 

 must be removed so that the plate will set 

 on the runner-top and come level with the 

 crossbar surface. To further stiffen the 

 runners laterally, triangular braces similar 

 to tiiose in the rear runners are set as shown 

 in F"ig. 4. Diagonal braces A', Fig. i, must 

 be added to stiffen the runners for steering. 

 The frame and the front runners are 

 pivotally connected by means of a king- 

 bolt which should be about 12 in. long and 



Elevation of the motor-bob, showing the location and parts of the motorcycle used, steering 

 arrangement and main frame with dotted line designating the outline for a body and motor-cover 



a piece of i-in. gas-pipe, or, if preferred, a 

 piece of 8-gage steel tubing 134 in., outside 

 diameter. Make six stirrups out of i-in. 

 by 3^s"in. strap-iron. Two of these are 

 used for securing the tube to the frame 

 sides, the other four for securing the run- 

 ners as indicated in I'ig. 3. 



The stirrup-clips for securing the runners 

 to the axle-tul)e must be loose enough to 

 allow the runners to turn on the tube. 

 Thread the ends of the pipe and screw 

 ordinarN' pipe-caps thereon to iiold the run- 

 ners in place. 'I"he outline of the runners 

 should be long and flat, about as indicated. 

 These may be either solid or cut out as 

 suggested in the illustration. 



The Front Runners 



Build up the frrint runners as one unit 

 with each runner 36 in. long, (j in. wiile anil 

 l>^ in. thick. Make the flat part of these 

 runners about 24 in. long to facilitate 

 turning the front part in steering. The 

 center crossiiar J shouUl be of hardwood 

 42 in. long, 4 in. wide and 23 < in. thick. 



^ in. in diameter. It is located lyi in. 

 from the front of the frame and directly in 

 the center, where a \ertical hole is bored 

 through the pieces G, E and F. In the 

 center of the crossbar J of the front run- 

 ners drill a hole large enough to receive the 

 kingbolt and taper it outwardly toward the 

 bottom so that there may be some pla>- for 

 the bolt. 



Cut from a jiicce of boiler plate, or an\' 

 1.4-in. steel, a jilate 6 in. loHg and 2)2 in. 

 wide. In the center of this make a hole to 

 receive the kingbolt. Near each corner of 

 the plate, drill and countersink holes for 

 3/4-in. wood screws. These are used to 

 secure the plate to the crossbar J. Between 

 the iilate and the frame member /■" place a 

 l.irge washer to further facilitate the turn- 

 ini;. Put on a similar washer at the lower 

 I'ud of the kingbolt and linish with either 

 a large nut or cotter. 



Mounting the Motorcycle 



Having proceeded thus far the chassis is 

 readv for the motorc\Tle. Remove the 



