Alexander Cummings, a Scottish watchmaker obtains the patent for the toilet. His designs included a pan with a slide valve across the bottom. The bowl contained a few inches of water, held by the valve. When finished, the use pulled a lever to slide the valve open, and fill the bowl with more water. The contents of the pan were released in a trap below. This was the forerunner of the modern toilet.
Harrington writes the treatise "Metamorphosis of Ajax" a satirical look at the waste system. In it he describes his design of the flush, overflow pipe, and cistern.
While used in the palace, the water closet was not widely used in Harrington's time because a sophisticated sewage system did not exist.