. Electric railway journal . nce to steel because it had been found that the steeltubes pitted badly. The shell is lagged 4 in. thickaround the main drum and 1 in. around the water leg,a Russia iron jacket covering the boiler up to thesmokebox, which fits snugly over the whole. The lag-ging conceals the large joints in the shell and imparts atank-like appearance to the boiler. From this it will be seen that the boiler is really ofthe standard fire-engine type. The water level is suchthat approximately 1 ft. of the top of the tubes is ex-posed to steam and not to water, so that it acts assuperh
. Electric railway journal . nce to steel because it had been found that the steeltubes pitted badly. The shell is lagged 4 in. thickaround the main drum and 1 in. around the water leg,a Russia iron jacket covering the boiler up to thesmokebox, which fits snugly over the whole. The lag-ging conceals the large joints in the shell and imparts atank-like appearance to the boiler. From this it will be seen that the boiler is really ofthe standard fire-engine type. The water level is suchthat approximately 1 ft. of the top of the tubes is ex-posed to steam and not to water, so that it acts assuperheating surface. In addition, there is a dry platefitting loosely on the tubes, and located 2% in. below thetop head of the boiler, to prevent sudden drafts of steamfrom carrying the water out of the boiler. Superheatedsteam is needed for two blowers in connection with theequipment, one of them being used as an atomizing Stack Deflector ^Air Supply Cab Pari if ions a Safety Valve set Hp lb. SiAir Supply I Oil Fillingand Drain. Water Tank4400 lb. Cap. Filling STEAM HEAT BOILERS—DIAGRAMMATIC ARRANGEMENT OF HEATER AND STORAGE TANK /O/IF/ll/nJ*^. of course it cannot be economically used to heat up acold train. The evaporation works out to about 5 water per square foot of heating surface, with a ratioof 8V2 lb. of water per pound of oil burned. The im-provements in design in general, are the result ofco-operative action on the part of the electrical depart-ment of the railroad company, J. F. Otis of the OswegoSteam Carriage Boiler Company, who designed all threeof the above-mentioned types of boilers, and B. , special inspector, who is in direct charge of themaintenance and operation of the steam-heat boilerson the electric locomotives. Final Development The present standard design is most prominentlycharacterized by a water leg 18 in. deep and 2V2 , as well as by two expansion joints in the lengthof the shell, the latter being formed in two parts, ofwhich the e
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