The foghorn shed is the only one known from a Victorian lighthouse, and the two vertical boilers which power the steam operated foghorns are rare in their original setting.
32.
The lorry was based on an unknown prototype : a long-wheelbase undertype, with a small vertical boiler mounted unconventionally off-centre in the cab, and no windscreen.
33.
For that reason, and to avoid the problems of tube erosion with exposed vertical tubes, many of the multi-tubular vertical boilers were instead arranged with their tubes horizontal.
34.
Vertical boilers have also been built of the multiple fire-tube type, although these are comparatively rare; most vertical boilers were either flued, or with cross water-tubes.
35.
Vertical boilers have also been built of the multiple fire-tube type, although these are comparatively rare; most vertical boilers were either flued, or with cross water-tubes.
36.
The remains of the Black Cat group include several caved shafts, a Marshall portable steam engine, a vertical boiler, a colonial boiler and a more recent Southern Cross diesel engine.
37.
The distinguishing feature which differentiates " African Queen " from the Brimscombe boats is the use of a vertical boiler on a vessel larger than vessels built by Abdelas with such boilers.
38.
Competing vertical boilers of the period had semi-submerged tubes with their upper ends in the steam space above the water level, leading to erosion and rapid tube wear around the level.
39.
The site contains a very rare undertype semi-portable steam engine and winching unit and a 4.5m high vertical boiler which is the largest of this type recorded in North Queensland.
40.
The first steam locomotive to be put to use by the Treffry Estates was a small four-wheel vertical boiler locomotive built by Sara and Burgess in Sentinel known as " Toby ".
