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acetic acid add ammonia added addition alloy ammonia ammonium antimony arsenic assay assayer base metal bead beaker boiling borax bottle burette button c. c. of decime carbonate charcoal chips chromium clean cobalt color cool copper covered crucible cupellation decime salt solution decime silver decime solution dilute hydrochloric acid dish dissolved dried drop evaporate filtrate funnel furnace glass rod gold grains gramme heat hot water humid assay hydrochloric acid iodine iron lead sulphate liquid litharge litre melted mercury method milligrammes mixture muffle necessary nitre nitric acid normal solution ounces oxide paper percentage piece pipette placed platinum points of silver porcelain potassium cyanide poured powder precipitate present proportion pure silver quantity redissolve removed sample scorified silver chloride silver fineness silver nitrate slag soda sodium sodium carbonate solu stirring substance suitable sulphide sulphuric acid thiosulphate tion titre tongs vessel warm weight xanthate zinc
Page 88 - Open the twice-folded paper so that it shall form a cone having one thickness on one side and three on the other. Place the cone in a funnel ; hold it with the thumb inside and the fingers outside of the funnel, and wet the paper by a jet from the wash bottle. The filter should fit closely to the funnel all over except at the point, but especially at the rim, which should be air-tighf.
Page 54 - ... flask to remove the liquid, which, without this precaution, would remain there; the mark cd is then raised to the level of the eye, and, by a suitable pressure of the forefinger on the upper orifice, which may be obtained by giving the pipette a slight alternating circular movement between the fingers, the solution is allowed to run out gradually.
Page 54 - It is here necessary to remark that in order to regulate the slow and regular runnings of the liquid from the pipette, by the pressure of the forefinger, the latter ought to be neither too moist 'nor too dry; if too...