GERBER TESTERS. 



141 



The " Rapid " gearing makes an unpleasant noise, and a great 

 deal of the power employed to drive the machine is wasted in 

 friction. 



Fijr. 17. Gerber Tester. 



It is far better to discard the methods of driving sold with 

 the machine and to employ a yard of blind cord (of the best 



Fig. 18. Gsrber Tester, electrically driven. 



quality), one end of which is fixed into a wooden handle. This 

 is given one or two complete turns round the spindle ; the handle 



