Conversation so far:
What did James Black do?
James Black was an American knifemaker best known for his improvements to Bowie knife designed by Jim Bowie.
Why is the Bowie knife famous?
Jim Bowie had become famous for his use of a large knife at a duel known as the Sandbar Fight.
How many knives did James Black sell?
After Bowie's death in 1836, James Black did a brisk business selling his knives to pioneers bound for Texas. Everyone seemed to want Jim Bowie's knife.“

Question: What else was Black famous for?
Self-contained rewrite: Besides the bowie knife what else was James Black famous for?