How did the Human Torch character in Marvel Comics #1 differ from the Human Torch of the Fantastic Four?

The Human Torch introduced in Marvel Comics #1 was an original Golden Age character named Jim Hammond, an android created by Professor Phineas Horton who could spontaneously combust. This character is distinct from Johnny Storm, the Human Torch of the Fantastic Four, who is a human teenager who gained his powers from cosmic rays in 1961. Although they share a name and fire-based powers, they are entirely separate entities, though Jim Hammond was later integrated into modern Marvel continuity.