The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[84]. Cylindrical boiler, with three fire tubes and three sets of return tubes. This form is much used, the surfaces requiring stays being very limited. It is made with double fire-boxes as shown, or with single fire-box, as [No. 81].

[85]. Cylindrical single flue and return-tube.

[86]. Cylindrical single flue and multitubular.

[87]. Cylindrical double flue and multitubular, longitudinal section similar to [No. 86].

[88]. Cylindrical saddle boiler, multitubular, used for shallow vessels, launches; &c.

HOUSEHOLD BOILERS.

[89]. Kitchen “ell” boiler.

[90]. Kitchen or back boiler, for ordinary grates.

[91]. “Saddle” boiler. The varieties of this type are legion. Every conceivable cross-bridge, water-way, tube, and flue has been added to it by various makers. See Messrs. Graham and Fleming, and other makers’ Lists.

[92]. Annular cylindrical greenhouse boiler.