[Illustration: THE TWO FLUE BOILER.—Fig. 31.]
[Illustration: THE SIX INCH FLUE BOILER.—Fig. 32.]
Maxims and Instructions for the Boiler Room Useful to Engineers, Firemen & Mechanics; Relating to Steam Generators, Pumps, Appliances, Steam Heating, Practical Plumbing, etc. · 第 67 / 328 题