Talk:Euler's Disk

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It is requested that an image or photograph of Euler's Disk apparatus and/or annotated explanatory diagram be included in this article to improve its quality. Please replace this template with a more specific media request template where possible. The Free Image Search Tool or Openverse Creative Commons Search may be able to locate suitable images on Flickr and other web sites.

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Pure marketing speech. — Preceding unsigned comment added by 212.87.21.35 (talk) 09:33, 9 August 2012 (UTC)[reply]

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)[reply]

Perhaps a picture or diagram would help. 128.112.139.195 (talk) 21:14, 9 January 2014 (UTC)[reply]

Agreed. I've added an {{image requested}} above. Reify-tech (talk) 07:34, 21 March 2014 (UTC)[reply]

Made first stab at an image. -AndrewDressel (talk) 14:30, 21 March 2014 (UTC)[reply]

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)[reply]

The parameter ${\displaystyle \alpha }$ 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 ${\displaystyle a}$ 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, ${\displaystyle \alpha }$ should be explained, so it doesn't add unnecessary befuddlement for the reader. Reify-tech (talk) 07:27, 21 March 2014 (UTC)[reply]

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)[reply]

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 "${\displaystyle \alpha }$", for the second equation to make sense. Otherwise, where does the "${\displaystyle \alpha _{0}}$" 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 ^{[dubious – discuss]}, 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)[reply]

Hello fellow Wikipedians,

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• 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

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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)[reply]

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

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."

... and how a full moon and a lunar eclips are possible? Thy SvenAERTS (talk) 01:07, 13 September 2022 (UTC)[reply]