A Gramme machine , Gramme ring , Gramme magneto , or Gramme dynamo is an electrical generator that produces direct current , named for its Belgian inventor , Zénobe Gramme , and was built as either a dynamo or a magneto .
A Gramme machine , Gramme ring , Gramme magneto , or Gramme dynamo is an electrical generator that makes direct current . It is named for its Belgian inventor , Zénobe Gramme .