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Lot 68

A MODEL OF A SINGLE CYLINDER, HORIZONTAL 'BAYONET FRAME' MILL ENGINE,
circa 1880,

22 September 2015, 13:00 BST
London, Knightsbridge

Sold for £3,500 inc. premium

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A MODEL OF A SINGLE CYLINDER, HORIZONTAL 'BAYONET FRAME' MILL ENGINE, circa 1880,

The mahogany lagged cylinder is 2.5" bore x 5" stroke, with integrally cast cylinder foot and single piece valve chest and draincocks. The expansion valve gear is driven by twin eccentrics. The pinned crosshead stands vertically in the trunk guide and the forked barrelled connecting rod has split bearings with steel keep-plate, driving a recessed well formed crank with the flywheel end supported on a pedestal bearing.

A Porter governor stands on its arch on the frame and is belt-driven by a two-to-one ratio pulley wheels and a two-to-one bevel gear train with lubricated shaft.

Four-times engine speed means fast revolution of the governor weights against the urn-like counterweight. This caused little hunting and in this case, drives a governor butterfly valve with counterbalanced lever, actuated by a long pivoted rocking lever reachrod and short barrelled connecting rod.

Finished in cream and brightwork. Moulded mahogany plinth. 13 1/2 ins (34cm) high x 32 ins (81cm) wide

Additional information

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