collector (commutator) of a dynamo ring machine ,dc power: dynamo commutator— segmented rings for direct flow - ac dc stock illustrationsCollector (Commutator) of a Dynamo Ring Machine ,DC Power: Dynamo Commutator— Segmented rings for direct flowOld-fashioned
dc machine from siemens and halske for belt operation - ac dc stock illustrationsDC machine from Siemens and Halske for belt operationOld-fashioned, Power Line, Engraved Image