JKP, I think I get it now. He starts at the beginning of a word, and "turns the wheel" one space for each new letter. At a new word, the wheel is reset to the initial position. This is not a conscious design, but rather a consequence of the online applications Stellar is using. It's just easier for him to guess words if he can always start at the same position.
Stellar: sorry but your method is even more useless than I thought. By resetting the wheel at the start of each word, you forfait many of the benefits of a polyalphabetic cipher. A would-be code breaker can still use one of the easiest tricks in the book: look for frequent, short words, guess what they should be and deduce from there how the cipher works. An Alberti cipher is supposed to continue across words, so telling short words will look different each time - that's the brilliance of a polialphabetic cipher.
Stellar: sorry but your method is even more useless than I thought. By resetting the wheel at the start of each word, you forfait many of the benefits of a polyalphabetic cipher. A would-be code breaker can still use one of the easiest tricks in the book: look for frequent, short words, guess what they should be and deduce from there how the cipher works. An Alberti cipher is supposed to continue across words, so telling short words will look different each time - that's the brilliance of a polialphabetic cipher.