The saeter-horns will be heard no longer, and the song of the turbines will rise in their place.
Turbines can be made to revolve about either vertical or horizontal axes.
At Niagara Falls the turbines are 136 ft. below the surface of the river.
No other vessel was in sight and the only sound to be heard was the soft whirr of the turbines.
Thirty-six miles an hour its turbines ...