- Niagara Falls factory district map.
- Niagara Falls area factory history.
- A Woodward size D exciter governor on the left and a Woodward LHR 2500flb type gate shaft type governor on the right
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Greenock water wheel governor drawing, circa 1847.
- Last page 116.
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