« 2020
2022 »
January
February
March
April
May
June
July
August
September
October
November
December
All
- A Wisconsin hydroelectric power plany history project.
- 57
- 21
- 16
- Elmer Woodward's new hydraulic governor developed and patented in 1912.
- Elmer Woodward's vertical compensating type D water wheel governor.
- Elmer Woodward's new hydraulic governor. The full page advertisement from 1914.
- 15
- 9
- 11
- 5
- 5
- 6
- mdp.39015009269963-seq 1
- 3