TOOLS NEEDED 71 



The size which is graduated in thousandths, 

 and will take work up to an inch in diameter, 

 is best for your purpose. 



The next best caliper is the one shown in 

 Fig. 26, or a similar device with sliding arm 

 and scale graduated to 64ths and opening two 

 inches. This is the most practical caliper for 

 the beginner, as it is simple and small. Its 

 cost is about $1.50. It has a lock nut and the 

 reverse side gives looths of an inch. 



A much cheaper gauge is made of brass and 

 boxwood, similar in form to Fig. 26. One of 



Fig. 26. A Simple Form of Caliper. 



these will answer very well, although the grad- 

 uations are coarser than those of the other 

 calipers mentioned. 



There are several devices that are used by 

 some amateur rod builders which are not abso- 

 lutely necessary, but they are handy and can 

 be made to take the place of calipers at times. 



You will not make your rod a true taper 

 from handgrasp to top, but it will help you to 

 know how to do this, for the tapering of the 



