264 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



as to be very rigid. Driving is effected by means of a 2" belt run- 

 ning over a 5" pulley. The motor (1 H. P.) is of the Sprague type. 



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Variations of speed are obtained by the use of pulleys of different 

 sizes on the motor shaft. 



Both machine and motor rest on a brick pier, the machine being 



