Chemical Recreations: a Series of Amusing And Instructive Experiments, Which ...
Chemical Recreations: a Series of Amusing And Instructive Experiments, Which ...
Griffin, John Joseph, 1802-1877
The book Chemical Recreations: a Series of Amusing And Instructive Experiments, Which ... was written by author Griffin, John Joseph, 1802-1877 Here you can read free online of Chemical Recreations: a Series of Amusing And Instructive Experiments, Which ... book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Chemical Recreations: a Series of Amusing And Instructive Experiments, Which ... a good or bad book?
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The best kind of earthenware ones, are those called Hessian crucibles. These are of the shape represented by fig. 3. They sup- port a very intense heat without melting ; but, unfortu- nately, are liable to crack unless heated and cooled very gradually. Tbe crucibles made of black-lead, (which are generally made of the shape of fig. 1,) are not liable to be cracked by alteration of heat ; but they are unfit for the fusion of alkaline or saline matters. For these last men- tioned bodies, when par...ticular nicety is required, crucibles of silver must be used ; and, for exposing bodies to a very great heat, those of platinum are necessary. But for all ordinary purposes, the 'earthen-ware cruci- bles are the best in every respect. They are strong and cheap, and those are the grand points. You may buy at an ironmonger's, a set, (of shape fig. 3,) containing six, of different sizes, for ninejience. The metallic crucibles are sold by the ounce. Crucible covers (see fig. above tbe 3d. crucible,) cost from 2i/.
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