Chemistry In Daily Life; Popular Lectures by Lassar CohnChemistry In Daily Life; Popular Lectures by Lassar Cohn

Chemistry In Daily Life; Popular Lectures

byLassar Cohn

Paperback | January 9, 2012

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1896. Not illustrated. Excerpt: ... LECTURE XII. Alloys : Coinage.--Bronze.--Patina.--Brass.--Tombac.--Talmi gold.--Nickel silver.--Britannia metal.--Type metal.-- Nickel steel. Alkalo1ds: Methane.--Acetylene gas.--Benzene.--Pyridine.-- Coniine.--Quinoline. -- Kairine. -- Antipyrin. -- Phenacetin. --Narcotine.--Chloral.--Ether.--Hoffman's drops.--Chloroform.--Antiseptics.--Iodoform.--Carbolic acid.--Corrosive sublimate.--Salicylic acid. Metals are used not only by themselves, but alloys are formed by melting together several metals, and the properties of some of these alloys render them more valuable for certain purposes than their single constituents. For instance, those particular metallic alloys which are used for making coins pass through our hands every day. Pure gold, like pure silver, is so comparatively soft that both would wear away too quickly in commercial transactions. Older coins would soon fall off in their metallic value compared with those newly coined. But this happens only to a very small extent with the coins that are now used, inasmuch as copper is mixed both with the gold and the silver employed for coinage, for experience has shown that a sufficiently hard alloy is thus produced. The alloy of which German gold coins are made consists of 900 parts of gold and 100 parts of copper melted together. As 0-3584 gram of gold forms the coinage unit, under the name of a mark, a 10-mark piece weighs 3 982 grams (3-584 grams gold + 0-398 gram copper). One kilogram of gold is worth 2,790 marks. German silver coinage is made from an alloy of 900 parts of silver and 100 parts of copper, and 200 marks are coined from 1 kilogram of silver. No heed is taken of the intrinsic value of the silver, nor of the fluctuations in this value, for gold is the standard. One kilogram of silver is at presen...
Title:Chemistry In Daily Life; Popular LecturesFormat:PaperbackDimensions:94 pages, 9.69 × 7.44 × 0.19 inPublished:January 9, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217458726

ISBN - 13:9780217458726