a good dog? Who's a good dog? You are! Yes, you are!
Yes, you are!
Designed by John
Hays Hammond Jr and built by Benjamin Miessner (which resulted in
years of bickering over who actually invented the thing), "Seleno", as
it was known to its friends, was built during World War I to
demonstrate the directional apparatus that Hammond'd had been
developing for use in self-directing torpedoes. Shine a torch at
this electric dog and it will follow you anywhere. Presumably, a
torpedo caught in a searchlight would do likewise.
someone pointed out to Hammond that it was highly unlikely that anyone
was going to say, "I know that torpedo's following the searchlight
straight in, Fritz. Just keep shining on it until...
BOOM!", he decided that maybe acoustic direction was more practical.
however, a very good doggie.