ON THE APPLICATION OF THE NUMBER CIPHER TO THE DOTTED PRINTING
The problem which I now put before myself was to make dots in a printed book in which I could repeat accurately and simply the setting forth of the biliteral cipher. I had, of course, a clue or guiding principle in the combinations of numbers with the symbols of "a" and "b" as representing the Alphabetical symbols. Thus it was easy to arrange that "a" should be represented by a letter untouched and "b" by one with a mark. This mark might be made at any point of the letter. Here I referred to the cipher itself and found that though some letters were marked with a dot in the centre or body of the letter, those both above and below wherever they occurred showed some kind of organised use. "Why not," said I to myself, "use the body for the difference between "a" and "b;" and the top and bottom for numbers?
No sooner said than done. I began at once to devise various ways of representing numbers by marks or dots at top and bottom. Finally I fixed, as being the most simple, on the following:
Only four numbers—2, 3, 4, 5—are required to make the number of times each letter of the symbol is repeated, there being in the original Baconian cipher, after the elimination of the ten variations already made, only three changes of symbol to represent any letter. Marks at the top might therefore represent the even numbers
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