https://sites.google.com/site/cryptocrackprogram/user-guide/cipher-types/other/ragbaby
The Ragbaby cipher was invented by SHERLAC, a member of the American Cryptogram Association (ACA), and first described in the July/August 1955 issue of the ACA journal The Cryptogram.
The letters of the plaintext are in an encrypted alphabet, and a numeric key determines the deviation from this alphabet to form the ciphered letter.
The numeric key is based on the word number in the plaintext and the position in the word. In the first description of the key alphabet, a 24-letter alphabet was combined with I/J and W/X, although a 26- and 36-letter alphabet could also be used.
The encrypted alphabet is created from a keyword, with repeated letters omitted, followed by the unused letters of the alphabet in alphabetical order. J and X are replaced by I and W respectively.
The plaintext is written while maintaining the word separation, and numbers are written under each word in sequential order, starting with 1 under the first word, 2 under the second, 3 under the third and so on. Then the letters in each word are numbered consecutively starting with the word number. The numbering starts again at 1 if it exceeds the number of letters in the alphabet. Words containing hyphens and apostrophes are treated as a single word.