44 



FA KM APPLIANCES. 



more logs is under way, it would be perilous for any 

 who should venture to block the road. 



Figure 44 shows the general construction of the sled. 

 The bunks, a, a, are eight by ten inches and ten feet in 

 length; the sway bars #, b, are four by four inches ; the 

 reach, , is ten feet between the bunks, the beams, d y d, 



Fig. 44. MICHIGAN SLED. 



are ten by twelve inches, and the track is four feet eight 

 inches long. 



The particular feature of this sled is the concaves, x,x, 

 made in the beam, F, which fit two convexes in the 

 block, E, as shown in figure 45. These taper from the 

 top to the bottom, fitting snugly at the bottom, and open 

 one-sixth of an inch on each side at the top. By this 



. 45. SLED BUNTTEB. 



means slight play is allowed to the runners, which eases 

 the motion considerably on rough ground. A, in figure 

 45, shows one of the steel shoes which are four by five- 

 eighth inches; the runners, B, are four by six inches, and 

 four feet long ; the blocks, C, are four by twelve inches, 

 and three feet in length. The iron plates are shown at /), 

 the bolts at C ; the beam, which is ten b twelve inches, 



