File:Tower.bridge.99.machinery.london.arp.jpg
One of a pair of identical horizontal stationary steam engines built by Sir W. G. Armstrong Mitchell & Company of Gateshead in 1894. Used to pump water at 750psi to the hydraulic machinery that worked the bascules of Tower Bridge.
It is a twin tandem compound engine, fitted with Meyer expansion slide valves, driving force pumps by the tail rods.
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