[Phono-L] Class M Belt Adjustment.

[Thomas Edison]

Edison patent 499879 shows the tension adjustment you speak of. 

"The Screw C serves to adjust the frame A on the box B for the purpose of tightening

the driving belt as will be presently explained, and the lugs b' are slotted to permit 

 this movement the screw b being finaly tightend after the proper adjustment of the

driving belt has been secured." Patened June 20th, 1893 and applied for July 30, 1888. 

 

somewhere I have a few parts list for Perfected and class M phonographs.  This adjustment screw is located just under the left end of the mandrel, there should be a casting that has this screw, as part of the bottom motor  bedplate.  This can be seen in Fig 1 of the patent.
 		 	   		  
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