. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . revolving commuta-tor-cylinder and means for automatically giv- 70ing such cylinder a continuous longitudinalreciprocating movement equal to the length ofthe commutator-cylinder, of stationary com-mutator-brushes bearing on such cylinder,whereby the commutator-cylinder will be worn 75evenly and smoothly, substantially as set forth. 4. In a dynamo or magneto electric machine,the combination of the revolving commutator-cylinder with a magnet and a circuit-control-ling device giving said cylinder a longitudinal 80recip
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . revolving commuta-tor-cylinder and means for automatically giv- 70ing such cylinder a continuous longitudinalreciprocating movement equal to the length ofthe commutator-cylinder, of stationary com-mutator-brushes bearing on such cylinder,whereby the commutator-cylinder will be worn 75evenly and smoothly, substantially as set forth. 4. In a dynamo or magneto electric machine,the combination of the revolving commutator-cylinder with a magnet and a circuit-control-ling device giving said cylinder a longitudinal 80reciprocating movement, and stationary com-mutator-brushes, whereby the commutator-cylinder will be worn evenly and smoothly, sub-stantially as set forth. 5. The combination, with the main circuit, of 85a circuit-breaker, constructed as described,adapted , to break or close the main circuit atseveral points simultaneously,substantially asset forth. This specification signed and witnessed this 9011th day of March, 1880. THOMAS A. EDISON. Witnesses: Z. F. Wilber,John 0.
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