What machines did rube goldberg invent?

Rube Goldberg was a famous cartoonist and inventor, but he didn't actually invent any specific machines. He was known for creating whimsical, overly complex contraptions that performed simple tasks in elaborate, convoluted ways. These contraptions became known as "Rube Goldberg machines" or "Rube Goldberg contraptions."

He popularized the concept through his humorous cartoons, often depicting chain reactions of absurd events leading to a simple outcome like dropping a letter in a mailbox.

So, while Rube Goldberg didn't invent machines, he certainly popularized a unique and entertaining approach to invention that captured the imagination of generations.