Talk:Gray code

message: I OCR'd, corrected, and had translated the Moncel ref.  Lots of interesting details in there, including a section on the alphabet, but no clue about any Gray-code-like properties. The key bit where it could have been mentioned is here:
 The characters of the type wheel do not follow each other on this
 wheel in alphabetical order, but in the following order:
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
 A É E I O U Y B C D F G H J ...
If you look at the codes corresponding to this order, they are the reflected-binary codes.  The reason for choosing such a code is that they are laid out consecutively in that order on a wheel with 5 contacts, and they don't want more than one transition, potentially causing a glitch, in going from one position to the next as the wheel turns.  Some of the other sources imply that, but this one really doesn't.  I'm going to remove it.
My point is, the Gray code is not about the assignment of codes to letters.  It's about the internal ordering of the characters on the printing wheel.  More to do with printing than with telegraphy, and nothing to do with multiplex or with the keyboard; synchronous, yes, if one character is printed per wheel revolution and it turns at a constant speed.
Feel free to hat/hide this if you know how:  Dicklyon (talk) 00:03, 25 January 2021 (UTC)
thread_title: Moncel translation

message: Let's look at how the article's comments on Baudot got to where they are.
* In this 2002 edit, we got "The French engineer Émile Baudot used Gray codes in telegraphy in 1878. He received the French Legion of Honor medal for his work.", unsourced, from User:Heron.  I presume he got that from a source, but don't know what.
* In June 2014, at Talk:Gray_code/Archive_1#Baudot code, one of the first use of Gray code, an IP proposed saying more about Baudot.  
* On July 3, 2014, the IP added a ref to Pickover's Math Book, of 2009, which says "The French engineer Émile Baudot used Gray codes in telegraphy in 1878", quoting our article without attribution.  And it has a direct copy, plus color, of the patent drawing that I upload in 2006.  Seems like clear WP:CITOGENESIS to me.
* On July 4, 2014, User:Glrx pushed back on the talk discussion and asked for a reliable source, but didn't do anything about the article.
* That's where it sat until December 17, 2020, User:Matthiaspaul started adding a whole bunch of refs about Baudot, most not saying anything in support of him using a Gray code, as far as I can find.
What we really need are secondary sources that connect these telegraphy bits to Gray codes.  I see Knuth does that, so I'm getting a copy to inspect in depth. Dicklyon (talk) 03:01, 24 January 2021 (UTC)
replies: text: I needn't have waited for the Knuth book, as I see I had found it before and linked it above (here).  It says "More significantly, Γ5 was used in a telegraph machine demonstrated in 1878 by Émile Baudot, after whom the term 'baud' was later named. At about the same time, a similar but less systematic code for telegraphy was independently devised by Otto Schäffler."  That about it: "used in a telegraph machine" is supported by the sources, but the Gray code is still not very relevant to the Baudot code, or Schäffler's code, itself.  It's an internal detail of the sequential character matching at the print wheel.  Not sure why he says "code for telegraphy" in Schäffler's case.  Dicklyon (talk) 00:07, 3 February 2021 (UTC)
thread_title: More Baudot history

message: An IP editor claims the expressions are different from what's given in the ref. ~Kvng (talk) 13:18, 25 May 2021 (UTC)
replies: text: The number of transition in each dimension is necessarily even. The IP's claim look therefore plausible, while the current claim in the Wikipedia article must be wrong. --FvdP (talk) 15:42, 17 December 2021 (UTC)
thread_title:  Well-balanced 

message: I'm not sure why the table of values at the very top of the article also includes a different coding scheme which is not explained anywhere else nor has an article of its own. It makes the table more difficult to read while not adding anything that's related to the article, I suggest it's best removed Ruse.mp (talk) 07:58, 29 December 2022 (UTC)
thread_title:  Lucal code?