Pearl Engine House

Engine house, roughly square in plan, with a gabled roof. Formerly attached to the N side was a larger, rectangular, boiler house with chimney (now demolished); to the S is the Pearl Shaft (now capped), and to the SW is the area of the capstan pit and rope channel. Rubble walls, generally 0.6m thick, although the bob wall to the S, which supported the engine beam, is 1.2m thick below the point where the beam fulcrum is located. The roof was formerly slated. Ground floor openings to each elevation with replaced timber lintels; Tall brick arched opening set high in the S elevation for bob mount.

The N half of the floor contains the mountings for the engine cylinder, the cylinder block. The S part of the floor holds the cataract pit, which is about 2m lower than the cylinder block level.