David Carnegie Andrew Agnew, Protestant Exiles from France… (1886)
“ In 1696 the Landgrave made him a Privy Councillor, and he was frequently in Cassel to meet the calls of the public service. His incessant experiments and inventions excited great interest, but could not but arouse jealousies among monopolists and others interested in antiquated customs and institutions. He invented a steam-gun, and in the year 1707 he invited the Landgrave and the leading public men to witness its firing. ”
