Conversation so far:
When did Thomas Eakin's early career start?
Eakins' early career started in 1871.
What kind of works did Eakins produce in his early career?
Eakins' first works upon his return from Europe included a large group of rowing scenes, eleven oils and watercolors.
What was Eakins' most popular early career work?
Eakins' first and most famous is Max Schmitt in a Single Scull (1871; also known as The Champion Single Sculling).

Question: What is a Single Scull?
Self-contained rewrite: What is a Single Scull?