DISCUSSION ON PUMPS FOR LOW LIFTS; ARCHIMEDEAN SCREW FOR LIFTING WATER; CENTRIFUGAL PUMPS.
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CENTRIFUGAL PUMPS. 41 Mr. WILFRID AIRYobserved, with regard to the term " spiral angle " used throughout his Paper, that in Fig. 2, A B C was a spiral line drawn on the cylindrical core ; B D was a tangent to Pig. 2. < E ,... - c the spiral A B C at the point B ; B E was a line on the surface of the core parallelto the axis of the cylinder; and the acute angle D B E was called the " spiral angle" of the spiral line B C...
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