“Project Rainbow” was an experiment conducted upon a small destroyer escort ship during World War II while the ship was in Philadelphia Harbor at the Navy Yard and while it was at sea. The purpose of the experiment was to make the ship invisible to enemy detection. The accounts vary as to whether the original idea was to achieve invisibility to enemy radar or whether the prize sought after was more profound: optical invisibility.
Either way, it is commonly believed that the mechanism involved was the generation of an incredibly intense magnetic field around the ship, which would cause refraction or bending of light or radar waves around the ship, much like a mirage created by heated air over a road on a summer day. The legend goes on to say that the experiment was a complete success ... except that the ship actually disappeared physically for a time, and then returned. They wanted to “cloak” the ship from view, but they actually achieved was apparent de-materialization and teleportation instead.
Either way, it is commonly believed that the mechanism involved was the generation of an incredibly intense magnetic field around the ship, which would cause refraction or bending of light or radar waves around the ship, much like a mirage created by heated air over a road on a summer day. The legend goes on to say that the experiment was a complete success ... except that the ship actually disappeared physically for a time, and then returned. They wanted to “cloak” the ship from view, but they actually achieved was apparent de-materialization and teleportation instead.