When the mill engine was stopped, either in the morning or after work had finished, there would be no electricity for lighting the mill as this was provided by generators worked by Victoria and Alexandra. To enable workers to enter or leave the mill during the hours of darkness, pilot lights were provided throughout the mill. Electricity for the pilot lights was provided by the the steam generating set housed in an annex at the side of the main engine room.
The 70KV D.C generator is driven by a vertical. twin cylinder steam engine made by Browett Lindley Engineers, Manchester. The operation speed is 600 revolutions per minute with steam at 160lbs/in2. The crank case is totally enclosed to prevent oil throwing out. Inside the crank case is an oil pump that delivers oil under pressure to the main bearings.
This is a compund engine where steam is used first in
the high pressure cylinders, then diverted to the second low pressure cylinder by a valve situated between them. Steam is exhausted to the atmosphere through a pipe that rises externally up the side of the generator room.
Engine speed is controlled through a throttle valve by a centrifugal governor that is fitted to the end of the crank case and contained within a round housing. The sensitivity of the governor can be altered while the engine is running by rotating a wheel in the control rod between the governor casing and the throttle valve.
On Site >