218 



LARGE-SIZED MACHINE. 



The pole AB (Fig. 1.) is 15 feet long, including the iron 

 ring at the point ; 6 inches broad, tapering to 3^ at top ) 

 and 5 inches thick. The iron ring at A is 4 In. in diam- 

 eter. At the top there is a small bend EC (Fig. 2.,) 3 In, 

 off the straight, in order to prevent the bark from being 

 chafed by the ring. Immediately at the point, but clear of 

 the ring, is fixed a small block of iron at C. with rounded 

 edges, 4 In. long, by 14 In. thick, well steeled, so as to trail 

 along the ground, and to prevent the point of the pole, when 

 the machine is not loaded, from cutting up the surface. 



There is likewise, on one side of the pole, a plate of iron 

 DC, extending from D, within 18 In. of the axle, to nearly 

 the top at E, for the purpose of strengthening the pole. It is 

 2^ In. broad, f In. thick, and sunk into the wood. This 

 plate for the sake of greater power, should be in one piece. 

 Its entire length is not visible in the diagram, owing to the 

 intervening delineation of one of the side-stays. 



The iron axle FG (Fig. 1.,) and also IK (Fig. 3.,^ is 5^ 

 F. long between the washers (but is nearly covered by the 

 case,) and 3 In. square; with a curve of 3 In. at H, for the 

 purpose of giving greater strength. It would not be conve- 

 nient, however it might suit large roots or branches, to make 

 the axle longer than the above dimension, on account of 

 gates, and other narrow passes, through which the machine 

 might be taken, and that seldom exceed 9 or 10 F. wide. 

 The heads of the axle WW are 14 In. long, and fitted to the 

 bushes of the wheels. The dust-hoops are 1 In. broad each. 

 The wooden case IK (or, as it is called, the axle-bed) is 6 In. 

 square, covering the iron 2 In., and consequently showing 

 only 1 In. of it. To the axle-bed are fixed two strong hooks 

 of iron ZZ, 6^ In. long, and strongly bolted to it, to which 

 the horses are attached, for drawing the machine. 



