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
Three-drum boiler
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Three-drum boilers are a class of water-tube boiler used to generate steam, typically to power ships. They are compact and of high evaporative power, factors that encourage this use. Other boiler desi
Sentinel boiler
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Three-drum boiler, casing removed
A flat of three Yarrow boilers
A Yarrow boiler, with the casing removed
A Royal Navy sailor cleans the water tubes inside a ship's boiler with a ribbon brush, c. 1939–1945.