A Series of Experiments on the Subject of Phosphori, and Their Prismatic Colours: in Which Are Discovered, Some New Properties of Light. Also, a Translation of Two Memoirs of the Late J.B. Beccaria, ... Taken from the Bologna Acts. by B. Wilson
A Series of Experiments on the Subject of Phosphori, and Their Prismatic Colours: in Which Are Discovered, Some New Properties of Light. Also, a Translation of Two Memoirs of the Late J.B. Beccaria, ... Taken from the Bologna Acts. by B. Wilson
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1776 Excerpt: ...question whether phosphori, in general, do actually emit the very same light they receive. In an experiment of so much consequence, as this appears to be, it seemed proper to have it tried in a manner which would be liable to the fewest objections. For this purpose, therefore, I had recourse to a beam of the sun's ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1776 Excerpt: ...question whether phosphori, in general, do actually emit the very same light they receive. In an experiment of so much consequence, as this appears to be, it seemed proper to have it tried in a manner which would be liable to the fewest objections. For this purpose, therefore, I had recourse to a beam of the sun's light, separated by a prism in the dark closet; by which means it was easy to let fall, upon the phosphorus, more intense, and less-compounded colours than the different-coloured glasses were capable of transmitting. And notwithstanding the closet, on account of it's smallness, would not admit a lens, and prism, to be placed at the distances recommended by Sir Isaac Newton, as the most advantageous for intercepting the foreign light which disturbs the colours, by rendering them more compound 7 and and impure; yet, the distance which the closet allowed of, with the prism only, answered the end far better than the other method of M. Beccaria's; because each colour of the refracted light, circumstanced as it was, approached considerably nearer to purity, than that light did which was transmitted through the coloured glasses, in the preceding exriments. Before I enter upon the experiment proposed, it may be proper to observe, that such phosphori only were employed, as were very brilliant of their kind, and had (according to M. Beccaria's method) been previously exposed to a red hot iron in the dark for a few minutes; or, however, till such time as they had ceased to exhibit phosphoric appearances. These phosphori so treated (and which for the future I shall call the prepared phosphori) were not exposed afterwards to any other light than what was necessary to the experiment. It is to be observed further, that as it was found material, in trying the fol...
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