- 45
- 46
- 47
- 48
- 56
- chi.82813478-seq 90
- 20
- 19
- 18
- 17
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- JAMES LEFFEL & COMPANY'S DOUBLE TURBINE WATER WHEEL CATALOGUE, CIRCA 1868.
- James Watt and the Kaufmann governor contraption.
- James Watt and the Kaufmann centrifugal governor system prototype.
- A James Watt steam Engine.