We all know that the Castaing machine was used in the Philadelphia Mint to impart the edge lettering on the half cents, cents, half dollars and dollars. Everyone also agrees that Jean Castaing, a French engineer, developed the machine in the late 1600's. I have been looking for additional information on Castaing for some time.

I have the works by Denis Cooper, Taxay and Breen, but am looking for additional information on Castaing himself. Can any of the E-Sylum readers suggest a book or other article I have missed? Thank you in advance for your assistance, Pete Smith.