ANGULAR CRANK. 



payments for taking out the patent. These 

 are the outcome of generosity unalloyed an 

 offering to the Chancellor of the Exchequer 

 which saves him from having to demand its 

 equivalent from the general public, and so 

 enables him to keep down our income-tax in 

 peace time to the modest proportion of one 

 shilling in the pound. 



Of all the parts of a bicycle none has been 

 more tempting to the inventor than cranks 

 and crank-movements. Endless devices have 

 been made by introducing special mechanisms 

 into the crank to give to the foot some other 

 than a plain circular movement, usually with 

 the object of obtaining for the foot greater 

 leverage against the resistance of the work. 

 Then, to save the foot from having to take an 

 inconveniently large sweep, it was often con- 

 trived that the pedal should return from the 

 bottom to the top of the stroke at a shorter 

 distance from the crank axle than that at 

 which it descended. 



One inventor, whose device the author saw 

 exhibited at a show, considered that he had 

 solved the problem of giving the foot greater 

 leverage without an inconveniently large sweep, 

 and by a method much simpler than the com- 

 plicated mechanisms referred to. 



His crank is shown in Fig. 25 at A B C, C 

 being the point for the attachment of the 

 pedal, and the position of the driving wheel 



105 



