ISBN: 9781331949732

Paperback, [PU: Forgotten Books], Excerpt from The Philosophical Magazine, Vol. 38: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Geology, Agriculture, Manufac… More...

Paperback, [PU: Forgotten Books], Excerpt from The Philosophical Magazine, Vol. 38: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Geology, Agriculture, Manufactures and Commerce The above memoir is divided into five chapters. In the first, the author treats of phosphorescence in general, and of its various modes. He defines phosphorescence to be "an appearance of light, durable or fugitive, not sensibly containing any heat, and without any subsequent alteration in inorganic bodies." He distinguishes four kinds of phosphorescence, viz. Phosphorescence by the temperature being raised, that which bodies exhibit when exposed to the light or to electrical discharges, that which arises from percussion, from pressure, or from friction, and last of all spontaneous phosphorescence. The author recognised the first of these various modes of phosphorescence in almost all bodies presented to us by nature, with but very few exceptions. For this purpose he placed them on a metallic stalk in a dull heat, in order that the lustre of a red hot support might not hinder him from observing the phosphoric light in bodies in which it shines but feebly. He made his experiments on bodies which light renders phosphorescent in a dark room, furnished at the side exposed to the sun with a small trapdoor which opened and shut at pleasure. Exposure to the rays of the sun for a few seconds is sufficient for exhibiting the shining of these bodies, the instant we intercept them, with all the brilliancy of which they are susceptible. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works., Medicine<

ISBN: 9781331949732

The Philosophical Magazine, Vol. 38: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Geology, Agriculture, Manufactures and Commerce (Classic Reprint) The-Philos… More...

The Philosophical Magazine, Vol. 38: Comprehending the Various Branches of Science, the Liberal and Fine Arts, Geology, Agriculture, Manufactures and Commerce (Classic Reprint) The-Philosophical-Magazine-Vol-38~~Alexander-Tilloch Medicine>Medical Ref>Med Ref Paperback, 1KG Limited<

2015, ISBN: 1331949734

[EAN: 9781331949732], Neubuch, [PU: Forgotten Books], This item is printed on demand for shipment within 3 working days.

2015, ISBN: 1331949734

Kartoniert / Broschiert MEDICAL / General, mit Schutzumschlag neu, [PU:Forgotten Books]

2015, ISBN: 1331949734

Kartoniert / Broschiert, mit Schutzumschlag neu, [PU:Forgotten Books]