Talk:Magnetomechanical effect

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Who is Guillemin

Just reproducing here the discussion in Talk:Delta E effect. Guillemin first name does not appear in the original compte rendu (1846) of the French Academy of Science, his only association is "Commission des chemins de fer". Other sources cite it as "A. Guillemin" but it is unclear yet where that came from. It could be Amédée Guillemin who wrote about trains, but almost all of his publications are from a later period, it could be his brother Eugène Guillemin [fr] who worked in the commission but it is still unclear. ReyHahn (talk) 15:18, 17 September 2025 (UTC)[reply]

I thought it was this one

• Guillemin, A. (1891). Electricity and Magnetism. United Kingdom: Macmillan and Company.

which has an 1891 date from translation to English so the French version would be some decades earlier. Since that book was aimed a popular readers I guess that is the same as Amédée Guillemin. However he was born in 1826 so a 1846 publication on magnetostriction experiments is possible but unlikely. Johnjbarton (talk) 16:06, 17 September 2025 (UTC)[reply]

The original source is

• Guillemin, Comptes Rendus, vol. 22, pp. 264–265, Jun. 1846. [No initial "A." in the original source]

Do you say that the source from 1891 discusses this effect? Amédée is a good candidate but he graduated in 1850 and most if not all his works are from later dates. Also it is unclear if he worked in railways even if he wrote a book about it. I think it is either professor Claude-Marie Guillemin (who signed sometimes as Alexandre Guillemin), or Amédée's brother who worked in railways and is a bit older.--ReyHahn (talk) 20:04, 17 September 2025 (UTC)[reply]

I didn't find any discussion in the book and based on the description by the translator I'd not expect it. It was not a specialist book.

Bozorth's Ferromagnetism cites a 1920 review by Felix Auerbach which seems to be this book in German and on page 313 is cites "Guillemin" as well as "A. Wertheim". Auerbach makes the point "bending" is not fundamental and moves on to torsion. Johnjbarton (talk) 22:33, 17 September 2025 (UTC)[reply]

Unfortunately Auerbach provides no additional clue.--ReyHahn (talk) 06:46, 18 September 2025 (UTC)[reply]

Journal du Magnétisme from 1849 refers to a recently deceased Baron de Guillemin whose library on magnetism has been sold and dispersed. Jähmefyysikko (talk) 06:59, 18 September 2025 (UTC)[reply]

I cannot find anything else about this baron. However I found that also in 1846 there is "Bulletin du Musée de l'industrie" where a J. Guillemin, mechanician, discusses a train safety system similar to the second article that "Guillemin" presented in the comptes rendus in 1846. This J. Guillemin (sometimes signed as Jul. Guillemin from Avesnes [1]) did also publish in the Annales des mines in 1826..--ReyHahn (talk) 08:51, 18 September 2025 (UTC)[reply]

Jules Guillemin and Claude Marie

I am now almost certain it is Jules Guillemnin (possibly 1802–1890 [2]), engineer from the École de mines. See [3]. Articles from the comptes rendus and bulletin du musée de mines [4] (both from 1846) seem to coincide.--ReyHahn (talk) 09:27, 18 September 2025 (UTC)[reply]

Finally according to the tables of the Archives de sciences physiques et naturelles of Geneva [5] the article of 1846 is classed under C.-M. (Claude-Marie) Guillemin. That said it means that there are two Guillemins in the Comptes rendus the train commissioner and Claude-Marie. The train commissioner is probably Jules Guillemin and the physicist is Claude-Marie. This could still be an error of the archives as the earliest work of Claude-Marie I can confirm is from 1849 on electricity, but kind of works (also Claude-Marie has signed sometimes as A. Guillemin).--ReyHahn (talk) 12:48, 18 September 2025 (UTC)[reply]