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A shell or flued boiler is an early and relatively simple form of boiler used to make steam, usually for the purpose of driving a steam engine. The design marked a transitional stage in boiler development, between the early haystack boilers and the later multi-tube fire-tube boilers .
An electric power generating house was built in 1915 and a tall chimney for the boiler plant built in 1916. The Lancashire boilers were supplied by Galloways . In 1923 the Mosley Common, Nos 1, 2 and 5 pits employed 1,338 underground and 198 surface workers while Nos 3 and 4 pits employed 951 underground and 143 above ground. [ 5 ]
The large Lancashire boiler is kept full of water from the roof gutters, and is used in the condenser (under the engine) and as feed water for the Cornish boiler. As originally built, the weaving shed was about 250 feet (76 m) by 200 feet (61 m), set into the hillside with typical north facing roof lights to provide natural light, it housed ...
A single operable Lancashire boiler provides steam to the engines. [ 2 ] Number 1 engine , built by Boulton and Watt in 1812 and rebuilt as a Cornish engine in the 1840s, is a single-acting, condensing engine with a bore of 42.25 inches (1,073 mm), a stroke of 7 feet (2,100 mm) and indicated power of 38.6 kW (51.8 hp).
These are arranged in mirror image pairs, in two separate engine houses, with a central boiler house (containing five Lancashire boilers with economisers) and chimney. The engines were built in 1885 by Gimson and Company of Leicester. All the engines are similar, and the following description is limited to only one, but applicable to all.
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A feature of the Fron-Boeth mill is a large Lancashire boiler, which must have been conveyed to site via the Pant Mawr tramway, as it is too large to fit through the tunnel. There is a slate lined channel beside the single acting table incline, indicating that it may have been a water balance.