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On the development of the chemical arts during the last ten years

โœ Scribed by A.W. Hofmann

Publisher
Elsevier Science
Year
1876
Tongue
English
Weight
538 KB
Volume
101
Category
Article
ISSN
0016-0032

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โœฆ Synopsis

Itofmann--JDevelopment of the Chemical Arts.

marginal rays. The ray R will cut the axis at/Vp, and/~' farther off at F, and therefore the image of a luminous point is no more a point, but appears elongated, and in the extreme has the shape of a coma, which in this case is directed downwards. If we reverse the lens, as in the next figure, so that the incident rays fall on the convex side, the coma is directed outwards. We see, we have here, by reversing the lens, opposite comas ; and such lenses of opposite character properly combined, at "Berichte fiber die Entwiekelung der Chemisehen Industrie Wi~hrend des Letzta~t Jahrzehends."

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โœ A.W. Hofmann ๐Ÿ“‚ Article ๐Ÿ“… 1877 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 352 KB

ON TttE DEVELOPMENT OF THE CIIEMICAL ARTS, DURING THE LAST TEN YEARS? By DR. A. W. HOF)IAh~.~. From the Ultemical ~5~ws.

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Weldon's process, lastly, is worked more rapidly than the old method, and requires a smaller number of sandstone troughs, though the latter advantage is out-balanced by the cost of the oxidation apparatus. The productive power of a sand-stone apparatus was, on the old process, 1270 kilos, of chlorid