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- Sectional view of the oil pressure relay valve water wheel governor.
- A beautifully restored Woodward Horizontal Compensating Water Wheel Governor.
- Elmer E. Woodward's governor in the Mill House at the Midway Village Musuem in Rockford, Illinois.
- Woodward Governor Company's horizontal type F water wheel governor
- ELMER E. WOODWARD'S PATENT NUMBER 608,245.
- Woodward Governor Company's shop order #1845, circa 1909.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- READING SHOP BLUEPRINT HISTORY.
- BLUEPRINT ON TRACING PAPER FROM 1918.
- An original 1922 drawing of a Water Wheel governor installation.
- A Lombard Oil Pressure Water Wheel Governor blueprint circa 1938.
- STEAM ENGINES AND VALVE SETTING HISTORY.
- ELEMENTS OF BLUEPRINT READING HISTORY.
- BLUEPRINT OF WYANDOTTE WORSTED COMPANY ROCHESTER, N.H.
- HOW TO DRAW A WATER WHEEL GOVERNOR CONTRAPTION.