Signs in the Enigma machine display.
The top one reads
The Enigma Machine
This is one of two radio message-encoding or "Enigma" machines captured from
the U-505 on June 4th, 1944. It has four rotors and an experimental printing
device in place of the normal illuminated letter board that eliminated the need
to write down the coded letters. Since it was experimental, a second machine
was present as a backup.
Two Enigma machines and nine mailbags of secret publications, weighing a
combined 1,100 pounds, were taken from the U-505 by the U.S.S.
Pillsbury boarding party.
The bottom one reads
The message is typed into the machine where it is encoded and printed onto the
ticker tape. The resulting garbled message is then sent via radio message key
over the radio.
For anyone to correctly decode the message the exact set-up steps must be
repeated on a copy of the machine. All ships at sea had the same machines and
This Enigma machine with its experimental printing device was taken from the
U-505 on June 4, 1944. This machine allowed for over 10 quadrillion possible
combination of "keys" to solve a message.