220 



LARGE.SIZED WHEELS. 



These wheels arc made of the very best materials, 5^ feet 

 high, and nearly upright; the dishing (as the workmen 

 term it) being only 1 i inches. 



The naves are Hi In. long, exclusively of the nave- 

 bands, and 13 In. thick. The spokes are 3| In. broad, and 

 li In. thick ; the Fellies -5 In. broad, and 3 In. thick ; tlie 

 iron rims ^ In. thick, and usually made in two pieces, 2i In. 

 broad each. 



The third wheel, having no great w^eight to bear, is made 

 light. It is 3i F. high, and entirely upright, without any 

 dishing. The naves are 9 In. long, exclusively of the bands, 

 and 9 In. thick. The spokes are 2i In. broad, and 1| In. 

 thick ; the Fellies 4 In. broad, and 2 In. thick ; the iron 

 rim \ In. thick. The wheel is fixed to the pole by a strong 

 pivot, on which it turns as the steersman may direct, in the 

 same way as the wheel of a plough. 



This wheel, when used, is generally from 2 to 3 F. high, 

 and placed about 3 F. from the point of the pole, at b (Fig. 2.) 

 But I should much recommend a different position (in order 

 to elevate the point of the pole, and, by consequence, the 

 branches from the ground,) namely, at a, 5 F. nearer the 

 axle, and within 18 In. or 2 F. of the end of the upper stay ; 

 from which it can be removed at pleasure, as may suit the 

 magnitude of the tree. 



The entire weight of the machine, when mounted on its 

 two wheels, is nearly 11 cwt. avoirdupois. 



This, it will be perceived, is a pow^erful though rather a 

 ponderous implement, and cannot be worked with fewer 

 than two, and sometimes three horses. It is meant for trees 

 not less than from five-and-thirty to five-and-forty feet high, 

 or more, and from fourteen to eighteen inches in diameter, 

 that is, from three-and-a-half to four feet in girth. 



