| Description | 2 sheets. On the same sheets: Transcript of letter. James Watt Jr. for Boulton Watt & Co. (13 London St.) to William Chadwell Mylne (New River Head). 20 Jul. 1822. Memorandum. Experiment at London Bridge Borough Water Works. 26 Jul. 1822. Memorandum. Mr. Mylne’s determination. Soho, 29 Jul. 1822. Docketed “Copy of letter to Mr. Mylne with estimate of 36 horse engine and pumps for Borough Water Works. Order given by New River Co. Engine to be at work in 6 months. Experiment made on the pressure on the pipes. 29th July – Mr. Mylne determines to have the pump 22 inches’ diameter.” |