A manual on dental metallurgy / by Ernest A. Smith.

  • Smith, Ernest A. (Ernest Alfred)
Date:
1903
Catalogue details

Licence: In copyright

Credit: A manual on dental metallurgy / by Ernest A. Smith. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    COPPER. with the tongue and notice that it possesses a peculiar faint, nauseous, metallic taste. B.q)cnmcnt 74.—Melt 5 grams, (or 50 grains) of copper on a cupel or charcoal support by means of the blow- pipe. Notice that the temperature required to fuse it is a little below that required to melt gold. Keep in the molten condition for some minutes, allow to solidify, then roll or hammer. Observe that the metal is more or less brittle owing to the presence of dissolved copper oxide. The copper is more readily melted in a small crucible in a suitable furnace. Exfcriment 75.—Melt 30 grams, (or 500 grains) of copper in a crucible with the addition of a little charcoal powder and add i gram, (or 20 grains) of metallic arsenic. When mixed pour into a suitable mould. EoU or hammer the resulting alloy and observe that the presence of the impurity causes brittleness. l^Xote.—About half the quantity of arsenic will probably be lost by volatilisation when conducting the experiment.] Experiment 76.—Melt 30 grams, (or 500 grains) of copper and add .5 grams, (or 10 grains) of antimony. Roll or hammer as before, and notice that the effect of antimony is very similar to that of arsenic. [JYute—Home of the antilnony will be lost owing to oxidation.] Experiment 77.—Place a strip of bright metallic copper in a solution of mercuric chloride (corrosive sub- limate). A silvery white deposit of metallic mercury is obtained, which, when gently rubbed, shows a bright metallic lustre. Experiment 78.—Dissolve i gram, (or 20 grains) of copper in a small quantity of dilute nitric acid; when all fumes are expelled dilute with water and place a strip of iron plate into tbe solution. Allow it to stand for