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In the drum-pit at the rear of the exisiting engine there are a number of old bed-stones in the piers just below the engine-house floor. The top of these is believed to be the original floor-level of the engine-house. There are the remains of a line of support timbers bolted to the bed-stones in the RH and LH foundation pits which would have supported the wooden flooring over the pits.
The pit-top outside had been raised by 15in when the new headframe was installed in 1901. There are 5 courses of bricks above the bed-stones suggesting that when the winder was replaced in 1904 the internal floor level was raised to bring it just above outside ground level.
On the wall of the LH pier in the drum pit there is an arcuate groove in the brickwork which coincides with the location of the original winding drum. It is believed that this was caused when the drum shaft failed. It is covered by oil staining which suggests that the engine continued in use for some time afterwards, following the fitting of a new drum-shaft.
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