James Watt & Co.
Directions for using the Patent Portable Copying Machines, invented & made by James Watt and Company, of Soho, near Birmingham
T. A. Pearson’s Printing Office, 1810.
An original technical manual – a fascinating source for fans of the history of science. I used it for writing my post “The Origin of Now (Part 4) – The Letter Copying Press and Mr Watt’s Secrets Recipes for Ink and Liquor”.