Tin foil and its combinations for filling teeth.

  • Ambler, Henry Lovejoy.
Date:
1897
Catalogue details

Licence: Public Domain Mark

Credit: Tin foil and its combinations for filling teeth. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    heat. If the conductivity of silver be taken as loo, then the conducting power of gold would be 53.2; tin, 14.5; gold being thus shown to be nearly four times as good a conductor of heat as tin. Among the metals, silver is the best conductor of elec- tricity. If its electrical conductivity be taken at 100, then the conducting power of gold would be 77.96; tin, 12.36; gold being thus shown to be more than six times as good a conductor of electricity as tin. Resistance to air: If exposed to dry, pure air, tin resists any change i£>r a great length of time, but if exposed to air containing moisture, carbonic acid, etc., its time resistance is reduced, although even then it resists corrosion much better than copper or iron. As to linear expansion, when raised from 32° to 212° F., aluminum expands the most of any of the metals. Taking its expansion as i, that of tin would be 3, i.e., aluminum expands three times as much as tin. (Dixon, 'A^ade ]\Iecum.'') Solids generally expand equally in all directions, and on cooling return to their original shape. Within certain limits, metals expand uniformly in direct proportion to the increase in temperature, but the rate of expansion varies with different metals; thus, under like conditions, tin expands