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

[76]. Oval flue boiler, with “Galloway” tubes. The Lancashire type is frequently combined with this form by arranging the two circular flues to open into one oval one.

[77] & [78]. “Elephant” boilers; employed in connection with coke ovens and other sources of waste heat.

MARINE BOILERS.

[79]. Ordinary box form, with internal fire-box and return flue.

[80]. Same type, but with two fire-boxes and multitubular return tubes.

[81]. Underneath fire-boxes and multitubular return tubes above the fire-boxes, sometimes duplicated, as [No. 82].

[Larger plate.]

[83]. Has two central fire-boxes and side return-tubes.

The foregoing box patterns are rapidly going out of use, as unsuitable for the higher pressures prevailing with compound engines.