After pointing out the features which differentiate the turbo-compressor from the multi-stage centrifugal pump, the author takes up the study of the pressure and volume changes occurring while a fluid is passing through one stage of the former and states the fundamental energy equations involved. He then discusses the number of stages to be used in a given case and follows this with an explanation of the method of laying out a compression diagram and of subdividing it according to the number of stages to be provided for.

The function of the impeller is next discussed and in this connection expressions are derived for the actual and effective impeller radii and the axial depth of channel of any radius. Blades and blade angles are also considered and a graphical method is described for calculating the theoretical head to be developed by an impeller.

The paper concludes with a brief study of the working of free-vortex and guide-vane diffusers, and of matters to be taken into account in designing in order to obtain a turbo-compressor of the highest possible overall efficiency.

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