- Great Western Power Company's Woodward type D Compensating Governors.
- A 1944 James Leffel Water Wheel blueprint drawing showing a Woodward size D governor.
- A Great Western Power Company's Woodward type D Compensating Governor.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A James Leffel Water Wheel blueprint number 43640, circa 1944.
- A schematic drawing of a Woodward compensating type mechanical water wheel governor.
- A vintage Hydroelectric Power advertisement project.
- A Woodward governor connected to a Victor turbine.
- Another vintage Woodward Governor Company governor application found in the year 2021.
- Blue print drawing history project.
- Blue print drawing history project.
- CARRICK & RITCHIC WATER POWER ENGINEERS, EDINBURGH.