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Rotary pumps are those in which the piston revolves, an example of the most successful form of rotary pump being shown in Fig.

The advantage possessed by a rotary pump is that it keeps the water passing through the suction in a continuous and uniform stream, as it has no valves.

If a rotary pump leaks, the efficiency is not impaired so much as in a piston or plunger pump, all that is necessary being to run the pump at a high speed.

The Sorata would not lie-to without somebody at the helm, and he could only leave the tiller lashed for a few minutes now and then while he labored at the little rotary pump.

Lubrication is of the complete forced circulating system, the oil being supplied to every bearing under high pressure by a rotary pump of large capacity.