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Q. How is a horizontal tubular boiler constructed?

A. It has a cylindrical shell, with heads riveted at each end, in which are placed a large number of tubes, 4 inches or less in diameter. It is set in brick work, with the furnace at one end, beneath the shell. The products of combustion pass under the boiler its full length and return through the tubes or flues to an up-take at the front end. It is furnished with a man-hole beneath the flues, and hand-holes for cleaning, and generally has a steam dome.

Freeman’s Horizontal Tubular Boiler.

Q. What are the advantages of a horizontal boiler?

A. It is simple in form, easy to construct, requires bracing only on the flat heads, which are sustained their greater part by the tubes, generates a large amount of steam for the space occupied, and is not difficult to keep clean with fairly pure feed water.