Abstract :
S. Z. Ferranti: It seems to me that when once the commercial practicability of such high pressures as it is proposed to use have been successfully demonstrated that you can then take full advantage of this provided you can go in for a very complete system of progressive feed heating (bleeding at a large number of points). As you already know, great economy results from carrying out this process very thoroughly up to the fullest practical limits. On the other hand, it is not possible to do this unless you heat the water from cold up to nearly the temperature of evaporation under working pressure, by bleeding. This in its turn necessitates a boiler which will work efficiently with very hot feed, and this can only be done by air heating to a sufficiently high temperature, I am sure you have considered this all very fully, and I should greatly appreciate your further views on the subject.
