Talk:Jan Ingenhousz

'in' or 'on' alcohol
I changed 'on' to 'in' because it looks like a typo. It may be that the carbon particles were actually on the surface of alcohol. In this case I think it needs to say that it was 'on the surface of' alcohol in order to make this clear. Davy p 01:34, 14 December 2006 (UTC)

[http://www.tau.ac.il/~klafter1/258.pdf] seems to have the answer on page 7. I've changed 'in' back to 'on the surface of'. Davy p 00:07, 15 December 2006 (UTC)

Spelling
I changed "practised" to practiced because of a spelling error. matt — Preceding unsigned comment added by 71.75.19.81 (talk) 18:32, April 11, 2007‎ (UTC)


 * It's sweet of you to care, but it's not a "spelling error": that how the verb is spelled in Britain and much of the rest of the world. — Preceding unsigned comment added by METRANGOLO1 (talk • contribs) 13:27, December 8, 2017 (UTC)

"He settled in Vienna in 1775"?
No, he settled there in 1768. It would also be interesting to know where he was born and where he died.--178.190.61.125 (talk) 16:20, 25 February 2015 (UTC)


 * I think the article is saying he went to Vienna in 1768, to innoculate the Hasburg family in 1768, and then moved there later in 1775. Also, born/death places are in the infobox. Joseph2302 (talk) 17:05, 25 February 2015 (UTC)

Semi-protected edit request on 8 December 2017
Change: He was born into the patrician Ingen Housz family in Breda in Staats-Brabant in the Dutch Republic to: He was born into the patrician Ingen Housz family, the son of Arnoldus Ingenhousz and Maria Beckers Ingenhousz,[add citation as follows] in Breda in Staats-Brabant in the Dutch Republic.

Citation: Ewing, Jack. "Jan Ingenhousz." Salem Press Biographical Encyclopedia, 2013.

Add after that sentence: His father bought and sold hides for use in leather goods before becoming a successful apothecary, which may have influenced his son to train for the medical profession. [Citation: same as above]

Add citation above to this sentence: Following his father's death in July 1764, Ingenhousz intended to travel through Europe for study, starting in England where he wanted to learn the latest techniques in inoculation against smallpox. Beviser (talk) 19:13, 8 December 2017 (UTC)
 * Red information icon with gradient background.svg Not done: please provide reliable sources that support the change you want to be made. HindWikiConnect  01:17, 9 December 2017 (UTC)

therefore has a claim as discoverer of what came to be known as Brownian motion
Difficult to say but probably he hasn´t. He used alcohol and its high evaporation rate can give rise to convection thus the enhanced movement of the particles that is not Brownian motion. — Preceding unsigned comment added by 90.174.4.67 (talk) 22:37, 8 December 2017 (UTC)

Totally agree and movement of the charcoal caused by evaporation would overwhelm the far more subtle Brownian motion. The entry could mention that the attribution to Ingenhousz of describing Brownian type motion is now being queried. Beale and Beale, 2011 (Wiki ref. 1) discuss and question the van der Pas interpretation in 1968 / 1971 of the Ingenhousz experiment and remark that it's 'almost certainly an overenthusiastic conjecture'. Ingenhousz was using the experiment to demonstrate the benefit of a coverslip which he is credited with inventing; one benefit is to significantly reduce evaporation. As Ingenhousz describes, with no coverslip 'everything' i.e. of all sizes is in 'violent' motion which is not a description of Brownian motion i.e. a gentler jiggling of particles typically 4 microns in size or less. (Quotes from van der Pas's translation, ref. 22 in Wikipedia entry Robert_Brown_(botanist,_born_1773). Declaration of own work (acceptable I gather on a Talk page to support a discussion): The experiment can be readily repeated (link below) with any student microscope and shows clumps of charcoal particles many times larger than those that exhibit Brownian motion are in motion caused by the evaporation currents. The second shows true typical Brownian motion of suspended fat globules in dilute milk.

https://vimeo.com/135788084 Ingenhousz repeat.

https://vimeo.com/133345758 Fat in dilute milk.

Triops56 15:07, 30 January 2018 (UTC)