| Rating | Solver | Clue |
|---|---|---|
| TURBINES | Water-wheels | |
| BACKWATER | Water thrown back by the turning of a waterwheel, or by the paddle wheels of a steamer. | |
| GOVERNOR | A contrivance applied to steam engines, water wheels, and other machinery, to maintain nearly uniform speed when the resistances and motive force are variable. | |
| HIGH-PRESSURE | Having or involving a pressure greatly exceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc. |