The Philosophical magazine; a journal of theoretical, experimental and applied physics . Account of a remarkable Fluid Cavity in Topaz. 235 cavity should burst. I founds however, that it was not veryexpansible by heat; and that it was so evaporable, thac at ordi-naiy temperatures the sides of the cavity were covered withvapour, whose particles or small globules were about the yi^dthof an inch in diameter. St. Leonards College, St. Andrews,February 28, XXXVIII. Account of a remarkable Fluid Cavity in Sir David Brewster, , , , , and Associate of the
The Philosophical magazine; a journal of theoretical, experimental and applied physics . Account of a remarkable Fluid Cavity in Topaz. 235 cavity should burst. I founds however, that it was not veryexpansible by heat; and that it was so evaporable, thac at ordi-naiy temperatures the sides of the cavity were covered withvapour, whose particles or small globules were about the yi^dthof an inch in diameter. St. Leonards College, St. Andrews,February 28, XXXVIII. Account of a remarkable Fluid Cavity in Sir David Brewster, , , , , and Associate of the Institute of France^. THE remarkable fluid cavity in Topaz which I propose todescribe is shown in the annexed diagram. The cavityitself is of a very irregular form; its greatest length, AB, being. 018 of an inch, and its greatest breadth, CD, OlO of an is filled with a fluid in which there is a large vacuity V. Thefluid does not expand with heat, and is therefore quite difi^crentfrom either of the two new fluids which I discovered in Topaz andother minerals. The vacuity V does not change its place byholding the crystal in different positions, but by a violent jerk itmay be moved to the other end of the cavity, and even brokeninto several separate vacuities. From the extreme sluggishnessof its motion it is very probable that it has a considerable degreeof viscidity; and that it is a fluid of low refractive power maybeinferred from the refraction of light through the broken surfaceof one of the crystals in the cavity. The cavity contains several ciystals, as shown in the of them have perfectly formed and brilliant facets, and arc* Commimicated by the A\ 236 On Continued Fractions in Quaternions. quite transparent; and all of them are moveable, descen
Size: 2184px × 1144px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookdec, bookpublisherlondontaylorfrancisetc, booksubjectphysics
