. The street railway review . uestions must beconsidered: the location of prime movers with respect to the boiler,the character and type of the boiler as well as the superheater towhich the latter should be attached, the length and size of steammains and other items. It may be of interest to give here some data as to which of thetwo types are most commonly employed, as reported by Herr Ernstbefore the Engineering Congress of the International Society ofBoiler Inspection at Zurich. Switzerland, 1902. Mr. Ernst states 860 STREET RAILWAY REVIEW [Vol. XV, No. 12. that, in the district of the Vienn
. The street railway review . uestions must beconsidered: the location of prime movers with respect to the boiler,the character and type of the boiler as well as the superheater towhich the latter should be attached, the length and size of steammains and other items. It may be of interest to give here some data as to which of thetwo types are most commonly employed, as reported by Herr Ernstbefore the Engineering Congress of the International Society ofBoiler Inspection at Zurich. Switzerland, 1902. Mr. Ernst states 860 STREET RAILWAY REVIEW [Vol. XV, No. 12. that, in the district of the Vienna Boiler Inspection and InsuranceSociety, which includes 599 power plants. 14 per cent are equippedwith the independcntly-fircd type; 86 per cent with the dependently-tired type, 10 per cent of the latter being located in the second andthird passes of the boiler furnace gases, while all others are locatedin the first and second passes. By arranging the types of superheater according to construction,three classes are obtained:. I.—The small tube system, where the steam passes through thesetubes surrounded by the hot gases. 2.—The tube system, where hot gases are conducted through thetubes and the steam travels around the same in a chamber. 3.—The system of comparatively large size tubes. A few types of this latter system exist where there is an addi-tional tube system through which boiler feed water or air is con-ducted, surrounded by the steam in the large pipe which is heatedby the hbt gases. The first of these systems is the most common, and one will there-fore find a great variation in the forms of construction, all, how-ever, being made of seamless, drawn, wrought iron or steel tubes,either straight or of return bend forms or coils, the ends being heldin headers. These headers are of welded steel or wrought iron, asillustrated in Fig. i, or of cast iron, a type of which is shown inFig. 2. In certain instances these headers consist of wrought ironplates riveted togethe
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