Often working alone or with a small crew, Mr. Harryhausen created and photographed many of the most memorable fantasy-adventure sequences in movie history: the atomically awakened dinosaur that lays waste to Coney Island in “The Beast From 20,000 Fathoms”; the sword fight between Greek heroes and skeleton warriors in “Jason and the Argonauts”; the swooping pterodactyl that carries off Raquel Welch in “One Million Years B.C.”
Perhaps his most famous special effects sequence:
And here he talks about his work in Jason and the Argonauts:
This was difficult to pull off. These days, computers do all of the work.