Census Reports Tenth Census. June 1, 1880 Volume 13 pdf

Census Reports Tenth Census. June 1, 1880 Volume 13 pdf

Census Reports Tenth Census. June 1, 1880 Volume 13 by United States Census Office Th

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Author: United States Census Office Th
Page Count: 312 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231735350
File size: 13 Mb
Download Link: Census Reports Tenth Census. June 1, 1880 Volume 13
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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. 1885 Excerpt: ...car. When the ore of a mine is treated by a custowi mill ore samples are often taken by the mine owners as a check upon the working of the mill. Battery Samples.--Battery samples are always taken at the mill, and in wet-crushing generally in the following manner? Every half hour or hour a rectangular iron box, or dipper, is passed along uudei the lips of the mortar where the pulp falls into the sluices, and a portion of the slimes and sand is taken, care bei ng observed to prevent concentration by the overflowing of the box. This sample is put in a bucket with others, and at tbe end of twenty-four hours the clear water is poured off and the collective samples for the day are dried find prepared for assay. i In tlry-cru8liiug mills it is usual to take the sample by passing a box along the lower part of the screen every hour or so. Sometimes the sample is taken from the conveyor or from the pulp in the bins. Tailings Samples.--Tailings samples are taken from one 01 all of the discharge plugs of the settler or are dipped from the top before each plug is drawn. A very good way is to dip a small gas-pipe iuto the settler close to the top, one end of the pipe being closed with the finger, and withdraw a portion of the pulp. Bullion Samples.--Silver bullion is sampled by taking a dip from the melted mass after stirring, or a little is poured into water while the crucible is still nearly full, and a little more when it is nearly empty. Either method is good. Gold bullion is sampled by chipjting two diagonally opposite corners of the bar after it is cast. Ore Assays.--Ore assays are generally made in crucibles, though with very base ores scorifiers are sometimes used. They are seldom corrected for loss in assaying. f ROASTING FURNACES. Systems Of Fubnaoes.--There ar...

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