 | Chemical Society (Great Britain) - 1887 - 1314 pages
...the aluminium plate and taken up by a red-hot boric acid bead in a platinum- wire loop ; when heated before the blowpipe the gold is obtained as an almost perfect sphere. The boric acid is dissolved off, and the minute sphere of gold measured under the microscope. A sphere... | |
 | 1887 - 550 pages
...bead is made of boracic acid on a platinum wire loop and pressed on the gold while still red-hot ; the gold adheres without difficulty, and by heating...water and placing the sphere of gold on a glass slide. No other flux seems to possess advantages equal to those of boracic acid for obtaining a sphere of... | |
 | Edward Hart - 1887 - 504 pages
...a bead is made of boracic acid on a platinum wire loop and pressed on the gold while still red-hot; the gold adheres without difficulty, and by heating...water and placing the sphere of gold on a glass slide. No other flux seems to possess advantages equal to those of boracic acid for obtaining a sphere of... | |
 | John Mitchell (F.C.S.) - 1888 - 1002 pages
...bead is made of boracic acid on a platinum wire loop and pressed on the gold while still red-hot ; the gold adheres without difficulty, and by heating...accurately after dissolving the boracic acid bead in a watch-glass with hot water and placing the sphere of gold on a glass slide. The plan of measuring minute... | |
 | 1894 - 458 pages
...acid in a porcelain capsule to dissolve the silver, and where the amount of gold is more than i dwt. to the ton a second boiling in strong nitric acid...accurately after dissolving the boracic acid bead in a watch-glass with hot water and placing the sphere of gold on a glass slide. The plan of measuring minute... | |
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... last drop of water and the gold with a glass rod on to the plate; the water is drawn off by a piece of filter paper and the plate gently heated till dry. Having thus obtained the gold in a pure state, a bead is made of boracic acid on a platinum wire... 