For an illustrated discussion, "Electric Motors Used in American
Coin Pianos and Orchestrions", see

  http://www.mechanicalmusicpress.com/registry/motors/cpmotors.htm 

Clicking on each thumbnail photo at the right side of the page opens
a new page with more photos and descriptions of the mechanisms used in
these motors.  This interesting web page was designed and written by
Terry Hathaway, based on information from Durward Center, Dana Johnson,
David Junchen, Rusty King, Dick Kroeckel, myself, and Terry's own
research.

Art Reblitz
http://www.reblitzrestorations.com/