File:Gravesande ring.png

DescriptionGravesande ring.png	Diagram of a Gravesande ring, an experiment demonstrating thermal expansion which is used in physics education. It consists of a small metal ball suspended from a stand by a chain. Below it is a metal ring. The ring is just big enough so when the ball and ring are at the same temperature, the ball can just fit through the ring. However, when the ball is heated by a spirit lamp as shown here, the metal expands and it's diameter increases, so it can no longer fit through the ring. p. 3 [...] 2^o L’expérience suivante, connue sous le nom d’expérience de S’ Gravesande ( 1 ), établit que les corps solides non cris- tallisés demeurent semblables à eux-mêmes en se dilatant. Une sphère métallique (fig. 2) passe librement à travers un anneau de même substance qui l’embrasse suivant un grand cercle. Si l’on vient à chauffer la boule sans modifier la tem- pérature de l’anneau, on constate qu’elle ne peut plus le tra- verser ; mais elle est demeurée sphérique, et ce qui le prouve, ( 1 ) S’ Gravesande, Physices elementa mathematica experimentis confirmata, sive Introductio ad Philosophiam Newtonianam ; Genève, 1778, t. II, p. 660. p. 4 c’est qu’elle touche l’anneau sur tout son contour. D’ailleurs, dès que la sphère s’est mise en équilibre de température avec l’anneau, elle le traverse de nouveau sans difficulté. Si l’on échauffe à la fois la sphère et l’anneau, celui-ci ne cesse pas d’embrasser exactement la sphère suivant un grand cercle : un solide creux se dilate donc comme s’il était plein. [...]
Date	Published in 1886.
Source	Cours de physique de l'École polytechnique, t. 2, 1^er fasc.: Thermométrie et dilatations, Paris: Gauthier-Villars et fils (4^e édition augmentée et entièrement refondue), p. 4 facsimile on Gallica Document downloaded using the form, only page 4, in TIFF format. Got a `N0077253_TIFF_13_13.tif` file. Cropped and converted it into PNG using The GIMP (`551x743+806+637`).
Author	Jules-Célestin Jamin (died in 1886) and Edmond Bouty (died in 1922) for the École polytechnique.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:25, 9 September 2008		551 × 743 (16 KB)	Herr Satz	don't know why, but it obviously don't work pretty well...
	23:10, 9 September 2008		551 × 743 (8 KB)	Herr Satz	{{Information \| Description = {{en\|Diagram of a 's Gravesande ring.}} {{fr\|Schéma d'un anneau de 's Gravesande.}} \| source = [http://gallica.bnf.fr/ark:/12148/bpt6k772537/f13.table Page 4] of ''Cours de physique de l'Éco

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