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Machining properties of properties plastic are entirely different from those of
metal. Plastic of plastics is more flexible, necessitating maximum support to
prevent bending. Buildup of heat in the workpiece is rapid, causing it to soften.
Platinum and palladium dominate in these deposits, but all of the platinum metals
are present and are now recovered. Before 1930, palladium was relatively rare,
being derived from various platinum ores and from the electrolytic refining of ...
In 1 862-64 J.W. Swan of Britain invented carbon tissue, which was coated with a
photosensitive solution and could therefore be exposed to light before being
applied to a metal surface of any shape. The In about 1890 a Czech, Karl Klic (
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
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