930 



Popular Science Monthly 



Steering Wheel. Front Sle d. 



^ ^^HH4^ 



The two pieces of the frame of the bob-sled to which the bobs are attached on the underside and the 

 cross-boards on the top; the two crosspieces shown are for the steering wheel post and the front bob 



each side of the lever. This construction is 

 clearly shown in the section taken at the 

 brake lever. 



The rod that connects the brake lever 

 to the brake is made of oak io3^ in. long, 

 2 in. wide and I in. thick. It is fastened 

 to the brake box with a large heavy strap 

 hinge and several bolts, as is shown in the 

 brake connection detail. Connection with 

 the lower part of the lever is made through 

 two plates, one at each side of the con- 

 necting rod. The plates are bolted to the 

 rod with two bolts. A heavy bolt passes 



in the cross-pieces of the sled. Drill holes 

 through the frame timbers and fasten with 

 heavy screws into the sled timbers, counter- 

 sinking the screw heads about half way 

 down in the frame timbers. 



The front or guiding sled is next set in 

 position. Make four iron plates 4 by 6 in., 

 as at B in the illustration. Bolt two of 

 these plates to the top board of the sled, 

 one plate on each side; and bolt the other 

 two to the cross-boards of the frame. The 

 centers of these plates should be drilled 

 to take a heavy bolt which should be 10 in. 



Mron angles 



through the ends of these 

 plates and the lower hole 

 of the lever, as is indi- 

 cated. Use washers and 

 locknuts, and rivet over 

 the end of the bolt. The 

 plates on the lever and 

 the rod are to take up the 

 wear and strain, thus pre- 

 venting the wood from 

 wearing and enlarging the 

 holes. 



The rear sled is at- 

 tached by placing the 

 notches of the two frame 

 timbers over the notches 



U-rw 



Details of the brake and 

 the front and rear bob 



long. Place several wash- 

 ers between the sled and 

 frame plates and drop the 

 bolt down through the 

 holes. Place two washers 

 over the ends of the bolt 

 and place on the nut and 

 lock nut and rivet over 

 the end of the bolt. These 

 plates prevent wear on 

 the wood parts and serve 

 to keep the sled true and 

 easy turning. 



Cut out two wood disks 

 from oak boards 3^ in. 

 thick and 10 in. in diam- 

 eter and bore a i^-in. 



