- James Watt and the Kaufmann centrifugal governor system prototype.
- James Watt and the Kaufmann governor contraption.
- A James Watt steam Engine.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- 1947 TABULATION GOVERNOR APPLICATION DATA.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- JAMES WATT GOVERNOR CONTRAPTION.
- 1947 TABULATION GOVERNOR APPLICATION DATA.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.