- WORKS OF THE JAMES LEFFEL & COMPANY.
- WORKS OF THE JAMES LEFFEL & COMPANY.
- WEIR DAM MEASUREMENT.
- The Woodward Cabinet Actuator Governing Equipment is on the right (yellow units)
- THE JAMES LEFFEL WATER WHEELS, Standards, Specials, and Samsons.
- THE JAMES LEFFEL WATER WHEELS, Standards, Specials, and Samsons, circa 1895.
- THE James Leffel Standard Specials and Samson WATER WHEELS.
- The James Leffel gave marker.
- The Chief Joseph Dam and Hydroelectic Power Plant equipped with Woodward turbine governor systems.
- SAMSON COMLIMENTS.
- PREFACE.
- LEFFEL COMPLIMENTS.
- Improving a Water Power.
- A vintage Turbine Water Wheel Manufacturing History Project.
- A Vintage Hydroelectric turbine Water Wheel and governor history project.