Coal And What We Get From It; A Romance Of Applied Science. Expanded From The Notes Of A Lecture…

Paperback | February 8, 2012

byRaphael Meldola

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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: ... of the next fraction, anthracene oil, is one of the greatest triumphs which applied chemical science Fig. Ii.--The Madder Plant (Rubia tincloria). can lay claim to since the foundation of the coaltar colour industry. This discovery dates from 1S68, when it was shown by two German chemists, Graebe and Liebermann, that the colouring-matter of madder was derived from the hydrocarbon anthracene. Like indigo, madder may be regarded as one of the most ancient of natural dye-stuffs. It consists of the powdered roots of certain plants of the gen lis Rubia, such as R. tinctoria (see Fig. Ii), R. peregrina, and R. munjista, which were at one time cultivated on an enormous scale in various parts of Europe and Asia. It is estimated that at the time of Graebe and Liebermann's discovery, 70,000 tons of madder were produced annually in the madder-growing countries of the world. At that time we were importing madder into this country at the rate of 15,000 to 16,000 tons per annum, at a cost of £50 per ton. In ten years the importation had fallen to about 1600 tons, and the price to £18 per ton. At the present time the cultivation of madder is practically extinct. There is no better gauge of the practical utility of a scientific discovery than the financial effect In addition to madder, a more concentrated extract containing the colouring-matter itself was largely used by dyers and cotton printers under the name cf "garancin." In 1868 we were importing, in addition to the 15,000 to 16,000 tons of madder, about 2000 tons of this extract annually, at a cost of.£150 per ton. By 1878 the importation of garancin had sunk to about 140 tons, and the price had been lowered to £65 per ton. The total value of the imports of madder and garancin in 1868 was over one...

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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: ... of the next fraction, anthracene oil, is one of the greatest triumphs which applied chemical science Fig. Ii.--The Madder Plant ...

Format:PaperbackDimensions:42 pages, 9.69 × 7.44 × 0.09 inPublished:February 8, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217824722

ISBN - 13:9780217824729

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