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Also, the production from a number of wells must be gathered at a central point
for distribution. A settling tank is usually used to separate the water, although
either heat or chemical treatment may be necessary to break down emulsions.
Gas is ...
In maceration, the drug, suitably prepared, is placed, together with the extracting
solvent (known as the menstruum), in a closed vessel and left for a defined
period, usually three to seven days, with occasional shaking. The product is then
Thick-sheet length to diameter, generally about 25 to 1 although 35 to 1 or more
is not uncommon for two-stage screws. Special alloys usually are used both for
barrel and screw, the latter being bored for heating or cooling. Direct current
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review