224 



THE POPULAR SCIENCE MONTHLY 



In a similar manner it can be used to drive any sort of light ma- 

 chinery, scroll-saws, dental engines, jewelers' lathes, coffee-mills, etc. 

 One of the uses to which it is peculiarly well adapted is the blowing 

 of organs. By a very simple mechanism the performer is given com- 

 plete control over it, so that the bellows may be kept continually full. 

 Among the heavier uses to which it has been applied are the running 



Fig. 3. 



of printing-presses and the lifting of merchandise elevators in business 

 iouses. To all these uses it is in every Avay adajDted, as it is always 

 ready for use, is no expense except when running, needs no care, and 

 is without danger. The extreme simplicity of the motor enables the 

 makers to place it on the market at a very low first cost, varying from 

 fifteen dollars in the case of the seven-inch to two hundred and sev- 

 enty-five in that of the forty-five-inch double wheel. 



The cost of operating these motors depends upon the locality in 

 which they are used. In New York and Philadelphia the insufliciency 

 of the water-supply prevents their use at all, but in most other j^laces 

 in this country they sCan be used at but nominal rates. The average 



