Sentinel boiler
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The Sentinel boiler was a design of vertical boiler, fitted to the numerous steam wagons built by the Sentinel Waggon Works.
Škoda-Sentinel "Super Sentinel" steam wagon
Section through a Sentinel boiler
Sentinel "5 tonner" steam wagon of 1906, with boiler dismantled for cleaning
Inner firebox of the later spiral design
A vertical boiler with horizontal fire-tubes is a type of small vertical boiler, used to generate steam for small machinery. It is characterised by having many narrow fire-tubes, running horizontally.
Cochran boiler
GNSR railmotor
Clarke Chapman 'wet back' "Victoria" boiler