I'm glad everyone is enjoying this post. Actually I've read that these towers were not only "lookout" stations, but they were also used for fire control for a 16" gun. From what I can gather these towers would triangulate a target up to 25 miles out at sea. The shell would take up to 58 seconds to reach it. I haven't read, though, if it was ever used. The area around here had quite a bit of u-boat activity mainly because of convoy assembly points and the navy ship yard just a little north in Philladelphia.
Cheers/Regards Bill