Fragments Of Science (volume 1); A Series Of Detached Essays, Addresses, And Reviews

Paperback | February 4, 2012

byJohn Tyndall

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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. 1897. Excerpt: ... IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT. 1868-69. Measured by their power, not to excite vision, but to produce heat--in other words, measured by their absolute energy--the ultra-red waves of the sun and of the electric light, as shown in the preceding articles, far transcend the visible. In the domain of chemistry, however, there are numerous cases in which the more powerful waves are ineffectual, while the more minute waves, through what may be called their timeliness of application, are able to produce great effects. A series of these, of a novel and beautiful character, discovered in 1868, and further illustrated in subsequent years, may be exhibited by subjecting the vapours of volatile liquids to the action of concentrated sunlight, or to the concentrated beam of the electric light. Their investigation led up to the discourse on 'Dust and Disease' which follows in this volume; and for this reason some account of them is introduced here. A glass tube 3 feet long and 3 inches wide, which had been frequently employed in my researches on radiant heat, was supported horizontally on two stands. At one end of the tube was placed an electric lamp, the height and position of both being so arranged, that the axis of the tube, and that of the beam issuing from Fig. 2. the lamp, were coincident. In the first experiments the two ends of the tube were closed by plates of rocksalt, and subsequently by plates of glass. For the sake of distinction, I call this tube the experimental tube. It was connected with an air-pump, and also with a series of drying and other tubes used for the purification of the air. A number of test-tubes, like F, fig. 2 (I have used at least fifty of them), were converted into Woulf'a flasks. Each of them was stopped by a cork, through...

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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. 1897. Excerpt: ... IV. NEW CHEMICAL REACTIONS PRODUCED BY LIGHT. 1868-69. Measured by their power, not to excite vision, but to produce heat--in ...

Format:PaperbackDimensions:126 pages, 9.69 × 7.44 × 0.27 inPublished:February 4, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217835929

ISBN - 13:9780217835923

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