workshop-door

Updated: June 7, 2025

The work was at first carried on with great secrecy, lest other makers should copy the art; and the precaution was taken of stopping the keyhole of the workshop-door while the casting was in progress. To secure himself against piracy, he proceeded to take out a patent for the process in the year 1708, and it was granted for the term of fourteen years.

Samuel Smiles - Industrial Biography, Iron Workers and Tool Makers