A Manual of Practical AssayingLongmans, Green, and Company, 1868 - 697 páginas |
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Página xvii
... Crucibles . London pots , 113. Cornish crucibles , 113. Hessian crucibles , 113. Crucibles of the Patent Plumbago Crucible Company , 114. Stourbridge crucibles , 114. Porcelain crucibles , 114 . Black - lead crucibles , 116. Charcoal ...
... Crucibles . London pots , 113. Cornish crucibles , 113. Hessian crucibles , 113. Crucibles of the Patent Plumbago Crucible Company , 114. Stourbridge crucibles , 114. Porcelain crucibles , 114 . Black - lead crucibles , 116. Charcoal ...
Página 39
... crucible must be removed from the fire and allowed to cool gradually . When completely cold , remove the cover and take out the contents by means of a spatula . If any adhere , a small brush will be found very useful for its removal ...
... crucible must be removed from the fire and allowed to cool gradually . When completely cold , remove the cover and take out the contents by means of a spatula . If any adhere , a small brush will be found very useful for its removal ...
Página 53
... crucibles are to be heated at once , they are preferable to the circular ; but the latter give the greatest degree of heat with the least possible consumption of fuel , and are to be preferred on that ac- count where one crucible only ...
... crucibles are to be heated at once , they are preferable to the circular ; but the latter give the greatest degree of heat with the least possible consumption of fuel , and are to be preferred on that ac- count where one crucible only ...
Página 58
... crucible subjected to its heat . All kinds of crucibles , including the Cornish and Hessian , soften , fuse , and become frothy in it ; and it is the want of vessels which has hitherto put a limit to its application . The exterior ( fig ...
... crucible subjected to its heat . All kinds of crucibles , including the Cornish and Hessian , soften , fuse , and become frothy in it ; and it is the want of vessels which has hitherto put a limit to its application . The exterior ( fig ...
Página 63
... crucible to fall down , and may cause the loss of the contents . For these reasons a crucible should always be supported on a piece of fire - brick about three or four inches high . In many cases an old crucible inverted will serve as a ...
... crucible to fall down , and may cause the loss of the contents . For these reasons a crucible should always be supported on a piece of fire - brick about three or four inches high . In many cases an old crucible inverted will serve as a ...
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Términos y frases comunes
added alloy ammonia amount antimony aqua regia arsenic ascertained assay bismuth black flux blowpipe boiling borax button calcined carats carbonate of soda carbonic acid cent charcoal chloride of silver clay cobalt colour combustion containing cooling copper Crown 8vo crucible cubic cubic centimetres cupel decomposed dilute dissolved Edition employed excess filter flame flask fluid fuel furnace fused fusible fusion gives glass globule gold grains grammes heat hydrochloric acid ignited inches iron lime liquid litharge manganese matter melted mercury metal method mineral mixed mixture muffle nickel nitrate nitric acid normal solution obtained operation Ounce oxide oxide of lead oxidising oxygen permanganate peroxide pipette placed plate platinum potash potassium powder precipitate produced proportion protoxide pulverised pure readily reduced roasting salt silica slag small quantity sodium specific gravity substance sulphate of lead sulphide sulphuric acid temperature thousandths tion tube vessel washed weight Woodcuts zinc
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