Talk:Pantelegraph

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Untitled[edit]

The pantograph principle, which underlies this "pantograph at a distance (Greek tele-)" needs to be mentioned and related to this technology, for completeness.--Wetman (talk) 20:19, 16 July 2009 (UTC)[reply]

Done Thanks for suggestion.--Doug Coldwell ^talk 21:01, 16 July 2009 (UTC)[reply]

Technologically challenged, I could never have described a pantograph so deftly.--Wetman (talk) 05:30, 17 July 2009 (UTC)[reply]

There is an inaccuracy on the main page of the Wikipedia today. Andrew Bain demonstrated a fax machine (as did two others) at the Great Exhibition, London in 1851, 16 years before the date of the Italian machine. To make the claim accurate the words "commercially exploited" need to be inserted, for Bain never tried to make money from his invention. —Preceding unsigned comment added by 91.125.73.104 (talk) 06:31, 23 July 2009 (UTC)[reply]

Done --Doug Coldwell ^talk 13:46, 23 July 2009 (UTC)[reply]

Further elaboration of the description?[edit]

I know I hate comments like this, but... I really can't figure out how this works from the description. Can the description of its working be elaborated to make it clearer? How is it "reading" the "document"? How does the pantograph come in to play? Thanks -- Spireguy (talk) 02:47, 1 June 2010 (UTC)[reply]

One of the key's is the use of special ferrous ink. That meant it had iron in it, therefore electricity would pass through it. At the "reading" end there was a metal stylus that would pass electricity when it hit the ferrous ink on a swing of the arm. When the stylus did not make contact with the iron ink on a swing there was no electricity passed. When it did come in contact with the iron ink then electricity was passed for that monent. This then was "signals" of on and off electricity that at the receiving end was received through a electrochemistry process that would make dark marks exactly when they it received the electrical "signals" of on. When it did not receive an electrical signal, then it was an "off" signal and the electrochemistry process did NOT produce dark marks at those times of the swing. As long as the sending mechanism and receiving mechanism were in sync then the image "received" was exactly the image as "read." The trick was to make sure the sending mechanism and receiving mechanism were in sync to get the correct image, otherwise it would come out as a real distorted image nothing like the original. The process is demonstrated here at The Secret Life of the Fax Machine on the top part showing what Mr. Bain patented in 1843. Questions?--Doug Coldwell ^talk 11:56, 1 June 2010 (UTC)[reply]

Thanks. I would suggest putting the above description in the article, it would make it much clearer. -- Spireguy (talk) 13:03, 1 June 2010 (UTC)[reply]

Done--Doug Coldwell ^talk 18:11, 1 June 2010 (UTC)[reply]

Potassium ferricyanide or ferrocyanide?[edit]

The article on Alexander_Bain_(inventor) mentions that his paper was impregnated with "a mixture of ammonium nitrate and potassium ferrocyanide", while this article mentions potassium ferricyanide, a different chemical with a very similar-sounding name. Is there a written source on which chemical Caselli actually used? Discoverator (talk) 09:29, 19 June 2021 (UTC)[reply]