Talk:Euler's Disk

Untitled
Pure marketing speech. — Preceding unsigned comment added by 212.87.21.35 (talk) 09:33, 9 August 2012 (UTC)
 * More like pure physics-speak. Not quite the same, but both may be baffling to the general public at times.  Reify-tech (talk) 07:34, 21 March 2014 (UTC)

I don't understand this article in the slightest.
Perhaps a picture or diagram would help. 128.112.139.195 (talk) 21:14, 9 January 2014 (UTC)
 * Agreed. I've added an  above.  Reify-tech (talk) 07:34, 21 March 2014 (UTC)
 * Made first stab at an image. -AndrewDressel (talk) 14:30, 21 March 2014 (UTC)
 * A nice initial effort. It would be even more convincing if there was some way of giving the impression of spinning/rolling, even in a static image. An animation, moving relatively slowly so that the spinning/rolling motion could be seen, would be ideal.  I have no idea how easy/difficult this would be to produce, and appreciate your efforts so far.  Reify-tech (talk) 14:45, 21 March 2014 (UTC)

Explanation of equation
The parameter $$\alpha$$ is introduced without explanation, but one can later deduce that it represents the angle of inclination of the disk. It does not appear in the equation, while the disk radius $$a$$ appears twice. Is it possible that the equation is mis-transcribed from the original paper? I don't have easy access to the source reference. At any rate, $$\alpha$$ should be explained, so it doesn't add unnecessary befuddlement for the reader. Reify-tech (talk) 07:27, 21 March 2014 (UTC)


 * I checked and the equation is correct. I tried to make the sentence introducing alpha a bit clearer. -- Jitse Niesen (talk) 08:34, 26 March 2014 (UTC)


 * Thank you for checking with the original paper. I'm still bothered by the impression that something isn't right.  Incremental analysis seems to imply that the first "a" appearance in the first equation should be an "$$\alpha$$", for the second equation to make sense.  Otherwise, where does the "$$\alpha_0$$" in the  second equation come from?  Is it possible that there was a typographical error in the original paper?  If so, was there an erratum, correction, or  commentary published later?  I feel uncomfortable flagging the first equation with "[sic]" or, but something just doesn't add up correctly.  Could somebody check the derivation in the original paper, or still better, point us to somewhere the paper is more accessible?  Reify-tech (talk) 15:05, 26 March 2014 (UTC)

External links modified
Hello fellow Wikipedians,

I have just added archive links to 2 one external links on Euler's Disk. Please take a moment to review my edit. If necessary, add after the link to keep me from modifying it. Alternatively, you can add to keep me off the page altogether. I made the following changes:
 * Added archive https://web.archive.org/20040617014034/http://physicsweb.org:80/article/news/4/4/12 to http://physicsweb.org/article/news/4/4/12
 * Added archive https://web.archive.org/20031102033740/http://tam.cornell.edu:80/~ruina/hplab/Rolling%20and%20sliding/Andy_on_Moffatt_Disk.pdf to http://tam.cornell.edu/~ruina/hplab/Rolling%20and%20sliding/Andy_on_Moffatt_Disk.pdf

When you have finished reviewing my changes, please set the checked parameter below to true to let others know.

Cheers.—cyberbot II  Talk to my owner :Online 05:28, 10 February 2016 (UTC)

Give credit to the Euler's Disk inventor!
This entry for Euler's Disk should definitely state that this apparatus was invented around 1987 by one Joseph Bendik. He invented it while working for an aerospace company in California. — Preceding unsigned comment added by 198.111.162.122 (talk) 17:31, 22 March 2017 (UTC)


 * You need to supply a reference to a WP:RS for this claim. Reify-tech (talk) 19:25, 22 March 2017 (UTC)A

A simple Google search will offer confirmation of this information! Check, for example, a source on the Internet called "The History of Euler's Disk" (--for this see www.eulersdisk.com). Many other sources confirm Joseph Bendik as the inventor of this scientific "toy."

Isn't Euler's Disk used to explain the plane, the movement and inclination of the Moon around the Earth?
... and how a full moon and a lunar eclips are possible? Thy SvenAERTS (talk) 01:07, 13 September 2022 (UTC)