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Wa′ter-snail.

The Archimedeanscrew pump. Also called the spiral pump. The spiral water-channel is wound around an inclined rotating axis, and somewhat resembles the convolutions of a shell, but preserves the same latitude while progressing longitudinally in the direction of the axis of rotation. See Fig. 4707.

The water-screw has an inclined axis with spiral projection, and rotates within a cylinder whose lower end is submerged.

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