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The New Zealand Railways Magazine, Volume 10, Issue 11 (February 1, 1936)
The lap engine at Boulton's Manufactory, Soho, Birmingham, 1788, showing Watt's parallel motion, valve gear and centrifugal governor, which remains virtually unchanged to-day. (Part of flooring removed to show separate condensor. Note also sun and planet driving gear invented by Watt to circumvent the use of the crank patented by Pickard in 1780.)
The lap engine at Boulton's Manufactory, Soho, Birmingham, 1788, showing Watt's parallel motion, valve gear and centrifugal governor, which remains virtually unchanged to-day. (Part of flooring removed to show separate condensor. Note also sun and planet driving gear invented by Watt to circumvent the use of the crank patented by Pickard in 1780.)