Time to delve into some engineering-with a few images that did not reach the pages of The Last Great Engineer. Images that I hope will add to the descriptions within the book. This picture refers to Patent No 8103, reproduced on page 55 of the book.
West and Harvey’s valve for raising water and other liquids-Patent No 8103
This valve is a self acting double beat valve. Beats are what Cornish engines called the valve seats. It was a relatively simple design, and one that quickly became adopted by waterworks all over Britain. I have shown this drawing to my engineering colleagues who have stated that it is now called a balanced valve.