, the horizontal distance between each two angles answering to the intervals of time between two high or low tides.
The lock-gate of a tidal basin.
One situate between the tide-water of a harbor or river and an inclosed basin when their levels vary.
It has two pairs of gates.
A mill driven by a wheel set in motion by the tide.
Mills of this kind were used in Venice as early as 1078, and they were employed in London in 1772.
Generally the water is admitted as the tide rises, through a sluice over which the mill is placed, into a reservoir, turning the wheel in its passage through the sluice.
At high tide the sluice gates are shut until the tide has fallen sufficiently, when they are again opened, and the water again turns the wheel during its outward passage.
The mill may float on the surface of the water, rising and falling with the tide.
The flood-gate in this