Popular Science Monthly 



929 



front wheel of the machine and all the 

 movable parts of the spring-fork, leaving 

 only the main fork as shown in Fig. 2. 

 Bore a cross hole through the block G just 

 back of the kingbolt and secure the fork 

 to the block by means of the front axle. 

 To maintain the motorc\'cle in a vertical 

 position make the suppor: as follows: 



Rear runner and front-bob detail showing 

 the plan of teetering and tilting devices 



Make two eyebolts, A, Fig. 4. These bolts 

 should be at least 6 in. long as they are 

 used for adjusting the stay-rods B. These 

 stay-rods arc made with an eye at the lower 

 end for linking into the eyebolts A. Bend 

 the upper ends into a hook to engage the 

 fork stem. Place these in position as shown 

 and tighten the nuts at the lower end of the 

 bolts A, so that the motorcycle may be 

 readily adjusted and secured in a perfectly 

 vertical position. Do not use continuous 

 rods for this purpose, as there must be a 

 hinge-action at the eyebolt to allow for the 

 \ertical movement of the rear wheel of the 

 motorc>'cle. 



Tlie rear of the motorcycle is supported 

 by the brace L, Figs, i and 2, which is 

 shown in detail in Fig. 5. Make two 

 guides A, and secure them to the frame 

 sides by means of screws or bolts to allow 

 an opening between the guides just wide 

 enough to bear against the luggage-carrier. 

 The crossbars, A'l, Figs, i and 2, should be 

 located at least 4 to 6 in. above the top of 

 the luggage-carrier. Cut a crossbar B, 

 Fig. 5, from a piece of hardwood ^4 in- 

 thick and notch it at the ends as shown in 

 the detail C, making them wide enough to 

 let this bar move freely on the guides A. 

 Between B, Fig. 5 and the crossbars .1/, 

 Fig. I, insert two spiral springs each strong 

 enough to exert an initial pressure of at 

 least 25 lbs. and preferabh- 50 lbs. when in 

 jjosition. The purpose of these is to prevent 

 the motorcycle from jumping up and down 

 when running over obstructions. 



To transmit the driving force from the 

 motorcycle wheel to the bob take two 

 pieces of J/2-i'i- gas-pipe, or i-in. No. 16- 



gage steel tubing, flatten them at the ends 

 and drill one end to fit over the rear axle 

 ends. Let these tubes extend forward as 

 shown at P, Fig. i , bolting the forward ends 

 to the frame sides close to the front ends. 

 It will be readily seen that without these 

 braces the dri\e would be transmitted to 

 the sled through the front forks which 

 should not be subjected to such strain. 



Sleermg Apparatus 



Steering is accomplished by means of a 

 wheel. The steering post may be con- 

 structed of I -in. gas-pipe and the wheel 

 may be simple or elaborate, according to 

 individual taste. At the lower end of the 

 pipe secure a spool of hardwood about 3 in. 

 in diameter with about i in. of the pipe pro- 

 jecting be}ond the spool. On the crossbar 

 N, Figs. I and 2, place a piece of flat iron 

 about 34 in. thick as indicated, thus fur- 

 nishing the support for the lower end of the 

 steering post. Run a pin through the end of 

 the pipe or screw on an ordinary pipe-cap 

 to prevent the post from backing out of the 

 collar-plate. Support the upper end of the 

 steering post by passing the post through 

 the upright guideway at the rear of the 

 motorcycle. The detail is shown in 

 Fig. 6. 



A piece of J<4-in. cable wire is anchored 

 solidly to the spool and two turns of it are 

 run around the spool each way from the 

 anchor and wrapped so that the wire will 

 leave the spool in each direction from the 

 bottom. Pass these wires around grooved 

 pulleys pivoted on the ends of the crossbar 

 N, Fig. I , and thence to the crossbar of the 



Guide for the rear part of the motorcycle 

 and steering cable supporting connections 



front runners. It is readily seen that by 

 turning the steering wheel to the right the 

 right end of the runner will be pulled back- 

 ward and the motor-tiob will steer to the 

 right, and vice versa. 



The Controls 



The question of control is a matter to 

 be determined by the kind of motorcycle 

 used, and only general suggestions will be 

 offered. The spark and throttle can be 



