Open AccessOn a method of finding the conductivity for heat
Publication year - 1912
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1912.0108
Subject(s) - foil method , rectangle , conductivity , electrical conductor , materials science , thermal conductivity , current (fluid) , composite material , mathematics , geometry , physics , thermodynamics , quantum mechanics
1. The method to be described for finding the conductivity for heat of a class of bad conductors may be considered to be an extension of a method given by one of us for finding the conductivity of substances mostly in the form of powder or small grains. In that paper the conductivity is inferred from the fall of temperature at different points from the axis of the mass, and the heat supplied to it by an electric current passing through a wire. In the present paper the body was in the form of flat layers, and the heat was supplied by passing an electric current through a thin metallic layer—in our case a piece of Dutch leaf. The leaf in the form of a rectangle was gummed to a piece of thin paper, and the current passed into it by two sheets of tinfoil also gummed to the paper and to the Dutch leaf along its opposite sides, the foil overlapping the leaf by spaces of about 1-2 mm., the two pieces of foil and the Dutch leaf forming a rectangle about 18 cm. long and 8 cm. wide, of which the Dutch leaf occupied the length of about 8 cm.