Talk:Magdeburg hemispheres

message: From other sources I get the impression that von Guericke set up his demonstrations with hemispheres large enough so that the horses could not pull them apart. Detailed information seems hard to find, however. More research required.
—Herbee 00:32, 12 Feb 2005 (UTC)
thread_title: Comments by Herbee

message: The phrase "Magdeburg hemispheres" has been trademarked by Kimball Physics Inc. See http://www.kimphys.com/mcf_vacuum_fittings/Catalog_PDFs/Magdebg_Hemisphere.pdf
I hope this doesn't affect the article's status in any way, but I'm still a bit new and I figured I'd note the fact.
--Yannick 17:10, 18 Jun 2005 (UTC)
thread_title:  intellectual property nonsense 

message: Article: "unnecessary use of two opposing teams of horses"
Only unnecessary if you have an object so immovable that 15 horses can't budge it.  I think it'd be easier to find another 15 horses.  :-)
Of course, if you could find something strong enough to anchor one side to, it would make the experiment easier, as you wouldn't have the problem of balancing forces:  I wonder how they kept the stronger team from pulling the weaker team away (as in tug-of-war). --Slashme 11:59, 6 December 2005 (UTC)
replies: text: I thought that it took that many horses to pull the spheres apart. ♫Deathgleaner 03:38, 31 August 2008 (UTC)
replies: text: I am suspicious of the claim that 15 horses can't lift a small car.   They must not have been trying very hard.Eregli bob (talk) 07:20, 5 June 2011 (UTC)
thread_title:  Unnecessary? 

message: according to the German wikipedia the size of the spheres was about 50cm - that would make them close to two feet. Not really important, but still... --Lamme Goedzak 16:26, 29 June 2007 (UTC)
replies: text: Yes, I've found various figures for the diameter: 50 cm (20 in) (1, 2, 3), 56 cm (22 in)  4 5, 6, and 37 cm (14 in) 7.  The device in the woodcut looks closer to 2 feet in diameter, for what that's worth.  The original hemispheres are still in the Deutches Museum, so it should be possible to get an answer.  I want to include an estimate of the force holding the hemispheres together in the article.  It's proportional to the square of the diameter, so the factor of 2 spread in values results in a factor of 4 difference in the force.  I think I'll change the diameter in the article to the 50 cm figure, the most authoritative sources give that.   --ChetvornoTALK 19:26, 26 June 2008 (UTC)
thread_title:  size 

message: This is a little misleading.  Torricelli had been conducting experiments with suction pumps and was trying to determine what limited their lift height to about 24 feet, so these pumps produced a near vacuum, limited by any leakage and the vapor pressure of the water.  OF course, the barometer did have very high degree pf vacuum due to the low vapor pressure of mercury, but Torricelli recognized the space above the mercury column contained essentially nothing.Phmoreno (talk) 17:28, 18 December 2012 (UTC)
replies: text: Torricelli and Galileo did not have vacuum pumps. Galileo's initial observations were of large water siphons, and Torricelli produced his vacuum by inverting a glass tube full of mercury. Guericke built the first vacuum pump. So no, you need to do better research.--Yannick (talk) 19:57, 21 December 2012 (UTC)
thread_title:  The first artificial vacuum had been produced a few years earlier by [[Evangelista Torricelli]]? 

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thread_title:  Hey, Everyone. 

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thread_title:  External links modified 

message: It is late where I am, but I recall there being an urban legend that the nursery rhyme Humpty Dumpty was inspired by this experiment. This claim is likely false so far as I recall, but despite that, is the urban legend still notable enough to mention in this article? Shmuser (talk) 06:11, 27 September 2016 (UTC)
replies: text: With a source, perhaps. A &tbm=bks Google books search reveals only "... perhaps from a science experiment... . Interesting, but not very convincing on its own. Any another source? - DVdm (talk) 20:46, 27 September 2016 (UTC)
thread_title:  Humpty Dumpty 

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thread_title:  External links modified 

message: i rebuilt this one: :File:Magdeburg Hemispheres sheme.svg --Mrmw (talk) 07:23, 13 May 2020 (UTC)
thread_title:  svg 

message: I was reading the article, and I saw the second paragraph begins with this: "Speculation varied about the contents of the sphere. Many thought it was simply empty, while others argued the vacuum contained air or some finer aerial substance drawn from the mercury."
This text was originally added here: 
https://en.wikipedia.org/w/index.php?title=Magdeburg_hemispheres&oldid=1175989016
"Mercury" isn't referenced anywhere else in the article, and I can't see why it belongs here. I have no idea how it should be corrected. Zgystardst (talk) 17:59, 18 February 2024 (UTC)
thread_title:  "the mercury" — WHAT mercury?