The next was a favourite of that unfortunate king, Charles I.:—
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The next is rather good and somewhat difficult:—
Divide a piece of cardboard into twenty-six departments, and in each place a letter; then take another piece (small enough that the letters on the first piece can be seen), and fit it into the centre of the first, dividing this into the same number of departments; then put a piece of thread through the centre of both, so that you can turn the smallest card round, filling the spaces up with letters in any way you like. Thus:
In using the dial, turn it round until, say, the letter m in the middle card comes under the letter A in the outer circle; next take what you want to write, and find it letter by letter in the outer circle, putting down on paper what appears directly under it in the inner circle.
Now if you want to write “I shall come soon,” first write the letters A m, so as to enable your correspondent to fix his dial like your own, as the A is in the outer circle and the m under it in the inner—“Am d ufmyy rjxi ujjk.”
You may arrange your dial in any way you like, but must be sure to place what letter is under the A at the beginning of your cipher.
The next is something like the last:—