See THIS LINK
The third Earl, Charles Stanhope (1753-1816), was also a noted inventor, devising numerical and logical calculating machines, a microscope lens, a printing press and the process of stereotyping -- examples are in the Science Museum, London, and the Museum of the History of Science in Oxford. Gardner says a copy of the Logic Demonstrator is owned by the present Earl, so it may be here. The name Chevening is on some of the Stanhope items at Oxford, so they may have been made here.
To see an Ordnance Survey map click at THIS LINK
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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster
The original site is at THIS LINK