Talk:Foucault knife-edge test

Reference needed

 * A reference is needed regarding potential cost savings for major astronomical projects. It is common opinion that the Hubble project could have saved millions of dollars if they'd checked their initial figure with a hundred dollar Foucault device, but a good reference, preferably an academic or government source, is needed for that rather inflammatory statement. (I have a number of ATM references but this info could be construed as defamatory without a 'reliable source'.)Trilobitealive (talk) 17:06, 18 December 2010 (UTC)
 * Upshot of discussion on user talk pages was that this is probably not a common opinion. So its not a good idea to try to put it into the article.Trilobitealive (talk) 20:53, 9 January 2011 (UTC)

Converted source
Moved L. Foucault off to "Further reading". A contemporaneous account ("historical items and references close to the subject") is a primary source WP:EVALUATE and in-line this ref does not seem to support any statement - "most amateurs use" would mean the "Academie des Sciences, Paris" or "Annales de l'Observatoire impériale de Paris" would be predicting the future and "Foucault knife-edge test" does not need a citation, existence is not disputed. Also this has no translation to check WP:NONENG. Fountains of Bryn Mawr (talk) 05:13, 6 February 2011 (UTC)
 * I concede. See User talk:Fountains of Bryn Mawr for details.Trilobitealive (talk) 17:34, 6 February 2011 (UTC)

Why/How Does it Work?
Maybe a short explanation of why and how it works would be useful. CielProfond (talk) 23:46, 19 February 2018 (UTC)