. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. equired for use. fi. Gvyfiim and/»«•>■. ntttsts of each other. Two part* of uilcinod gypsum and one of fluor. wbeaintermixed and heated, fuse into a clear glass, presenting a mDk-whitc ea. 994 TEST TUBES, CITPELLATIOX, &C. amel on cooling. 7. Oxalate of Nickel, or Nitrate of Nickel, is used to detedpotash. It should be free from cobalt, for which
. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. equired for use. fi. Gvyfiim and/»«•>■. ntttsts of each other. Two part* of uilcinod gypsum and one of fluor. wbeaintermixed and heated, fuse into a clear glass, presenting a mDk-whitc ea. 994 TEST TUBES, CITPELLATIOX, &C. amel on cooling. 7. Oxalate of Nickel, or Nitrate of Nickel, is used to detedpotash. It should be free from cobalt, for which it may bo tested by treat-ing it with ; the result sliould give a browu, not a blue bead. The behavior of diiTerent minerals before the blow-pipe is are so refractory as to be wholly infusible ; some specimens melt onlyat the edges ; others arc easily fused, while some are dissipated wholly orin part Kobells scale for representing the various degrees of fusibility byfigures, is as follows: 1. Gray Antimony. 2. XatroUle. 3. Cinnumcix,Si»ne (Var. of garnet). 4. Black Hornblende. 5. Feldspar. G. Chrondro-dite. The fusibility, when equal to that of natroline. ia represented by 2 ;or if like hornblende, by 4, Fig. 59. Fig. ca The test tubes above noted are used to determine the presence of wateland other volatile components of various ores. The mode of operation Herxhibitod by Fig. 59, in which A represents the tube, B the mineral undertreatment in the flame of a spirit lamp, and C the aqueous or volritile pro-ducts usually condensed on the upuor part of the tube. Acid furaeamay be detected by inserting a strip of litmus or other pajier in the up-per part of the tube ; the fumes, if acid, will turn the paper red. CriKLLATioy. The object of process is to separate gold and silverfrom lead, by absorbing and oxidizing the base metal while the other is leftpure. Fig. GO represents the manner in which this process is nerformedty the blow-p
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
