The first records of the wordtestcome from around 1350. It ultimately comes from the Latin wordtestū,meaning “an earthen pot.” In Middle English,testwas used to refer to acupel, a container used to analyze ores. Did you know ... ?
The first records of the wordtestcome from around 1350. It ultimately comes from the Latin wordtestū,meaning “an earthen pot.” In Middle English,testwas used to refer to acupel, a container used to analyze ores. Did you know ... ?
First recorded in1550–60;fromLatinrēgulusliterally, “little king” (diminutive ofrēx); in early chemistry, “antimony,” so called because it readily combines with gold (the king of metals);-ule Discover More Example Sentences Mr. Regulus thought with Dr. Harlowe, that it was a pity I ...
In theKroll process, one of the ores, such as ilmenite (FeTiO3) or rutile (TiO2), is treated at red heat with carbon andchlorineto yield titanium tetrachloride, TiCl4, which is fractionally distilled to eliminate impurities such as ferric chloride, FeCl3. The TiCl4is then reduced with ...
You shall see the crude ores of California and Nevada passing on and on till they become bullion; You shall watch how the printer sets type, and learn what a composing stick is; You shall mark, in amazement, the Hoe press whirling its cylinders, shedding the printed ...
Chemistry.any substance that in small amounts is capable of increasing the activity of a catalyst. Also calledcollector.Metallurgy.a water-repellent reagent enhancing the ability of certain ores to float so that they can be extracted by the flotation process. ...
It was known from prehistoric times in native deposits and was also given off in metallurgic processes (the “roasting” of sulfide ores). Mercury united with most of the other metals, and the amalgam formed coloured powders (the sulfides) when treated with sulfur. Mercury itself occurs in ...
Hallmark, symbol or series of symbols stamped on an article of gold or silver to denote that it conforms to legal standards that define the maximum proportion of base metals that may be alloyed with pure gold or silver for hardening or other purposes; in