C.A.R.L. Ver Genius is remembered best, in some quarters, for his patented printer’s quoin. The patent is:
“Printers Quoin,” US patent 298,639, granted May 13, 1884, to C.A.R.L. Ver Genius of Galesberg, Illinois, USA.
Here’s a highlight from the patent:
BONUS: A modern, spirited discussion about quoins