I want to know the answer to the following question:
When did gag single-panel illustrations become known as cartoons?
All the background I'm provided with is that "Gag cartoons first began to proliferate in broadsheets published in Europe in the 18th and 19th centuries, and the term "cartoon"[h] was first used to describe them in 1843 in the British humour magazine Punch.". Is that enough to answer the question?