. Machinery and processes of the industrial arts, and apparatus of the exact sciences. These are the indications of the centrifugal theory. Practi-cally it will be obvious on the merest inspection of any centrifugal pumpthat they are carried out only partially. In fact, there is no need forattention to the second particular, since it is not in the least desirablethat the velocity of the water in a radial direction should be the other hand, the condition of greatest efficiency in this particularwill be satisfied by giving such form to the rotating apparatus that thesame volume of
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. These are the indications of the centrifugal theory. Practi-cally it will be obvious on the merest inspection of any centrifugal pumpthat they are carried out only partially. In fact, there is no need forattention to the second particular, since it is not in the least desirablethat the velocity of the water in a radial direction should be the other hand, the condition of greatest efficiency in this particularwill be satisfied by giving such form to the rotating apparatus that thesame volume of liquid shall pass through every concentric cylindric sec-tion in the same time, and that the radial velocity shall be constant. The general external appearance of the pump is shown in Fig. 45,where the form of the enclosing box is seen to correspond generally tothe condition just stated, and where the position of the driving pulleyon the axis of the rotary system is shown. Fig. 46 shows the system ofpallets (shown in section in Fig. 44) in place, and also makes more clear Fig. Gwynne & Centrifugal Pump—section through the axis—scale, 1-12. the manner in which the water is admitted. H is the pipe through whichthe water arrives from this source; H and H are sections of the twochannels by which it is led to K and K, the central openings by which it 180 PARIS UNIVERSAL EXPOSITION. enters the pump. One of the pallets appears at F. Between the rotaryapparatus and the box which encloses it, is an annular space into whichthe water is driven by the motive power, and which is indicated in beyond the limits of the pallets at G-, and shown in section in At Y, Fig. 13, is further observed a partition which shuts off thisannular space from the ascending tube L. At G is also indicated asmall opening from the annular space behind the partition to the tube L,which is designed to allow any air which may accidentally find its wayinto the pump to make its escape. In
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