- Woodward Governor Company's horizontal water wheel governor
- Speer Products Company letter to Woodward, circa 1958.
- Patent number 1,106,434. Sheet 2 0f 2.
- Patent page 1.
- Woodward shop order for a size D governor serial number 4180, circa 1919.
- Woodward shop order # 3969, shipped 2-14, 1928.
- WOODWARD GOVERNOR TABULATION DATA.
- WOODWARD SIZE D WATER WHEEL GOVERNOR SERIAL NUMBER 6039, CIRCA 1946.
- SHOP ORDER NUMBER 3969, CIRCA 1928.
- WOODWARD SIZE D COMPENSATING TYPE WATER WHEEL GOVERNOR DATA, CIRCA 1922.
- Woodward Governor Company's horizontal water wheel governor application.
- A Woodward Governor Company's size F horizontal water wheel governor in operaion.
- Speer Products Company letter. Page 2.
- Woodward Governor Company's horizontal water wheel governor
- Patent number 1,106,434, circa 1914.