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 is a type of fire-tube or water-tube boiler where the boiler barrel is oriented vertically instead of the more common horizontal orientation. Vertical boilers were used for a variety of steam-powered vehicles and other mobile machines, including early steam locomotives.
Detail of vertical boiler and associated steam engine in a working model steam launch
Taffy a replica of Chaloner, a de Winton vertical-boilered narrow gauge railway locomotive
Swiss rack railway locomotive (built 1858) for operating on the steep slopes of Rigi
East London Harbour 0-4-0VB by Alexander Chaplin & Co.