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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    sul]ihuretted hydrogen water. Notice that the metal is soon covered with a yellow film of cadmium sulphide. Exferiment 82—Mix together in a mortar mercury and cadmium ; observe that combination readily takes place, producing a soft tin-white mass. Allow it to stand for some time, when it hardens and forms a brittle mass which softens when moderately heated and can be kneaded like wax. BISMUTH. Experiment 83.—Prove the brittleness of bismuth by. crushing in a mortar. Heat the metal in a crucible ; observe its low melting-point and that it burns with a blue flame when heated to a high temperature. Cast the metal into a mould, and notice that it expands in the act of solidifying. Experiment 84.—Prepare an amalgam of bismuth by shaking powdered bismuth with mercury in a tube. Notice the liquid character of the amalgam obtained. ANTIMONY. Experiment 85.—Crush a little antimony in a mortar to prove its extreme brittleness. Melt the metal, noting its melting-point, raise it to a red heat; notice that it burns with a white flame, forming the white oxide. Experiment 86.—Place a little powdered antimony and mercury in a glass tube, shake well and observe that union does not take place readily even when heated. IRON AND STEEL. Experiment 87.—Take a piece of soft iron wire; notice that it bends readily without breaking; heat it to