. Cassier's magazine . ong probability of thedevelopment of a modified form—namely, a turbine with a high-pres-sure velocity compounded stage andthe remaining stages with the ordi-nary reaction blading—in which case it would be safe to use superheats upto 200 degs. F., or even more. Thisdevelopment has indeed already beenforeshadowed by Mr. Parsons him-self. The economy to be realized by theemployment of superheated steam inmarine engines depends naturallyupon the degree of superheat, and, tosome extent, upon the type of boilerand superheater installed, but it maybe taken as a conservative est
. Cassier's magazine . ong probability of thedevelopment of a modified form—namely, a turbine with a high-pres-sure velocity compounded stage andthe remaining stages with the ordi-nary reaction blading—in which case it would be safe to use superheats upto 200 degs. F., or even more. Thisdevelopment has indeed already beenforeshadowed by Mr. Parsons him-self. The economy to be realized by theemployment of superheated steam inmarine engines depends naturallyupon the degree of superheat, and, tosome extent, upon the type of boilerand superheater installed, but it maybe taken as a conservative estimatethat with reciprocating engines andthe ordinary boiler pressures every•100 degrees superheat decreases thecoal consumption by 8 or 9 per cent.,while with steam turbines the econ-omy is in the neighbourhood of 6 or7 per cent. It is interesting to note,moreover, that the percentage econ-omy in coal consumption will, with aproperly designed superheater, beactually greater than in the steam SUPERHEATED STEAM 641. 7-5 642 CASSIERS MAGAZINE itself, since the efficiency of the boileris increased, owing to the baffling ef-fect on the gases, due to the super-heater—this applying naturally onlyto superheaters which are an integralpart of the boilers and not to theseparately-fired type, where the com-paratively low efficiency lessens theoverall economy. There is a largenumber of vessels, particularly Ger-man, which, originally designed touse only saturated steam, have beenafterwards adapted for superheatersand superheated steam, and some in-teresting results have been obtainedas to the difference in fuel consump-tion under normal steaming condi-tions. La Garonne, a vessel ownedby the Compagnie Generate Transat-lantique, with a triple-expansion en-gine of about 1,300 indicated horse-power, was fitted with a superheaterof the Schmidt type to give about 200to 220 degs. F. superheat, and it wasfound on an average over a long runthat whereas with saturated steamthe coal consumptio
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