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One of seven original drawings of the engine and seating supplied by Messrs Boulton and Watt to Messrs Bott, Birch, Bower and Randall - a side elevation of the cylinder end of the working beam and the parallel motion, probably June 1795
One of seven original drawings of the engine and seating supplied by Messrs Boulton and Watt to Messrs Bott, Birch, Bower and Randall - a detail of the top of the connecting rod and its connection to the working beam, February 1796