frank rowlett gives the job of building the purple analog to a gentleman by the name of leo rosen. rosen was an m.i.t.-educated engineer who also happened to be part of rotc, not unusual for that day and time. and he was eventually assigned to the signals intelligence service. now, you have to take into account the fact that again he's never seen a purple machine. but he's looking through an electrical supply catalog one evening, and he notices telephone switches, and he says you know what, this device has the ability to multitask, and the only piece of technology i know that can do that is a telephone switch. so he builds the analog with a collection of wires, telephone switches, and a series of inputs. there's a keyboard that plugs into the various inputs. and in september of 1940, a little before pearl harbor, a year before pearl harbor, frank rowlett types in an encrypted japanese purple message. it runs through the analog, and it comes out decrypted. and now the americans are back in business. when purple is broken, it is a huge success. people like general marshall, the presi