Parsons helical gear for steam turbine, 1913, with portion of cover cut away Parsons helical gear for steam turbine 1913
Gear Box and one Shaft End Fitting for Revolution Indicator Gear Box and one Shaft End Fitting for Revolution
Example of Humphage's patent speed reducing gear as used in electric motors, ratio 13.64 to 1 Example of Humphage's patent speed reducing gear as used in electric motors 1899