Issue 9 and Volume 31.

CENTRIFUGAL PUMPS. It was in 1818 that the first practical centrifugal pump was invented in this country. In its design were laid down general principles of construction, which have since been followed in all the developments of the machine in America and Europe. The operation of these pumps is dependent upon the centrifugal force and impact imparted to the water by the rotation of the pump impeller, and upon the speed of the rotation depends the amount of the work done. Direct displacement, however, has nothing to do with the principle of these pumps, and the volume is considerably affected by a comparatively slight change in speed, though the variations are always in the same direction. The original Massachusetts pump has been improved upon by successive generations of makers, especially with a view (1) to proportion the waterways so as to offer the minimum of resistance to the flow of…

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