TheCodeBreakers
cipher clerk would consult the thick YU GO book of machine keys, plug in
the wire connections according to the key for the day, turn the four disks
in the box so the numbers on their edges were those directed by the YU
GO, and type out the plaintext. His machine would record that plaintext
while the other, getting the electric impulses after the coding box had
twisted them through devious paths, would print out the cipher-text.
Deciphering was the same, though the machine irritatingly printed the
plaintext in the five-letter groups of the ciphertext input.
The Alphabetical Typewriter worked on roman letters, not kata kana.
Hence it could encipher English as well as romaji—and also roman-letter
codetexts, like those of the J codes. Since the machine could not
encipher numerals or punctuation, the code clerk first transformed them
into three-letter codewords, given in a small code list, and enciphered
these
annaabi.ee 
