Assaying; In Three Parts ... Volume 2, Pts. 2-3 by Charles Howard AaronAssaying; In Three Parts ... Volume 2, Pts. 2-3 by Charles Howard Aaron

Assaying; In Three Parts ... Volume 2, Pts. 2-3

byCharles Howard Aaron

Paperback | October 12, 2012

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...after cooling, it must be weighed and its weight noted, or it may be adjusted by clipping to equality of weight with another of the same kind similarly dried. It is possible, by suitably folding, to adapt a filter to a funnel of which the angle is more or less than 60 degrees. Where much of this kind of work is to be done, a number of filters may be dried at once and kept under a bell-glass, or in any closed receptacle, in company with an open dish or beaker containing strong sulphuric acid. The drying of the niters before equalizing the weight, when one is.to be used as a counterpoise to the other, is only necessary when very fine.work is to be done; in many cases it suffices to take two filters from the same package, or to cut them from the same sheet, and equalize their weight by the aid of the scissors and balance. The counterpoise filter must, in all cases, be exposed to the same heat as the one containing the substance during the drying of that, and the two must be allowed to cool together before the weighing; in a particular case they should be cooled under a bell-glass in presence of sulphuric acid, which will prevent the accession of atmospheric moisture. The same may be said of substances which are to be weighed otherwise than on a filter. In strict analyses the substances are inclosed between two watch-glasses for the cooling in the dessicator, then weighed, glasses and all; but this is scarcely necessary in merely commercial assaying except with substances which absorb moisture rapidly from the air. In filtering, fill the filter often, not waiting for it to drain. In washing the substance on the filter, and the filter itself, let it drain before each fresh addition of water. If the quantity of the washings is immaterial, it is...
Title:Assaying; In Three Parts ... Volume 2, Pts. 2-3Format:PaperbackDimensions:40 pages, 9.69 × 7.44 × 0.08 inPublished:October 12, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217441238

ISBN - 13:9780217441230

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