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. 1903 Excerpt: ... by the good and excellent ones, with the poor analyses in smallest amount. The superior analyses, those of the first three ratings, constitute 64.70 per cent of all, and the inferior 35.30 per cent. In other words, more than a third of all the analyses which have been made in the seventeen years included by the ...
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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. 1903 Excerpt: ... by the good and excellent ones, with the poor analyses in smallest amount. The superior analyses, those of the first three ratings, constitute 64.70 per cent of all, and the inferior 35.30 per cent. In other words, more than a third of all the analyses which have been made in the seventeen years included by the collection are not worthy of use for general purposes, and a very large part of them are useful for no purpose at all. The labor expended on these 1.017 analyses has been almost entirely thrown away, if nothing more severe be said. These figures are sufficient to show that the standard of criticism with regard to the making and use of rock analyses is, or has been, far too low, and the showing can scarcely be called very creditable to the science. They at least justify the calling of the attention of petrographers to the state of affairs and to the urgent need of reform. It will be noted that the excellent and good analyses together amount to 1.102, or 38.25 per.cent of the whole. Of these, the chemists of the United States Geological Survey have made 655, or nearly 60 per cent, while of the 492 excellent ones alone they have made 437, or 88.82 per cent, figures which reveal clearly the preeminent position they hold in this branch of the science." "Of the fi55 analyses of igneous rocks (including tuffs) given in Bulletin 168, 437 are excellent, 218 good, 72 fair. 8 poor, and 1 bad. Of these the fair ones were nearly all made in the early days of the laboratory, while the poor and bad ones are thus rated on account of the nonseparation of alumina and iron oxides. 7 of them being of volcanic dust or sand. As to accuracy nearly all are rated A. It is gratifying to note that the analyses that are now being made by the New South Wales Geologica...
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Add this copy of Chemical Analyses of Igneous Rocks to cart. $22.66, fair condition, Sold by Anybook rated 5.0 out of 5 stars, ships from Lincoln, UNITED KINGDOM, published 1917 by Government Printing Office.
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Seller's Description:
This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 4000grams, ISBN:
Add this copy of Chemical Analyses of Igneous Rocks Published From 1884 to cart. $37.50, good condition, Sold by T A Borden Books rated 4.0 out of 5 stars, ships from Olney, MD, UNITED STATES, published 1903 by Dept of Interior.
Add this copy of Chemical Analyses of Igneous Rocks Published From 1884 to cart. $67.74, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
