DescriptionMan and Supply hoist motor generator. This generated the power to drive the hoist. Its output was varied by the exciter on the right. This variation made the speed of the hoist change. This method of speed control control was known as the Ward Leonard method. The generator is a Witton Direct current continuously rated shunt dynamo 970rpm 160kW 300 amps 500 volts.RightsPublic DomainCollectionReginald O'BrienSubjectMiningMining SitesMining Equipment