posted on Nov, 18 2004 @ 05:27 PM
I found an interesting theory:
"It is thought that the original Spring-Heeled Jack (for there was obviously
more than one) was an Irish nobleman, The Marquis of Waterford, who was renowned for his sadistic taste in practical jokes, and his scorn for women.
Author Peter Haining in his book "The Legend and Bizarre Crimes of Spring-Heeled Jack" believes that Waterford's idea for the character of Jack was
brought about by a humiliating experience with a woman and a police officer while travelling abroad. Haining believes that Waterford and his
rich friends thought up the idea as a prank to get even, by proxy, with the
police and women in general. Haining also believes that Waterford (who had friends who studied applied mechanics) helped him invent "spring-heeled
boots" (boots with powerful springs in the heels) to help him with his attacks. It is likely that he also learned the technique of the fire-eater
in order to heighten the supernatural aura of Spring-Heeled Jack. In
addition, Waterford had strangely protuberent eyes, which matched the
descriptions of Jack. He was also in the area when many of the attacks
occured. As a final piece of evidence, the servant boy who scared Jack away saw a crest with the letter "W" on the man's cloak.
Although the mystery of Spring-Heeled Jack's identity has probably been
ascertained, it is far more entertaining and romantic to think of
Spring-Heeled Jack as a mysterious creature of the night who may someday leap from the shadows again."
That came from here