Title
Specification of the patent granted to Mr. James Watt of Birmingham, for his new method of copying letters and other writings

Published in
The Repertory of Arts and Manufactures, Vol 1; London, 1794.

The Repertory of Arts and Manufactures is a brilliant source for research on the history of science. I found it very helpful for writing my post “The Origin of Now (Part 4) – The Letter Copying Press and Mr Watt’s Secrets Recipes for Ink and Liquor”.