Abstract
The object of the experiments described in this paper was to learn how the specific inductive capacity of a dielectric is affected by change of temperature. Cavendish observed an increase in the capacity of a glass condenser when it was heated, but gave no measure of the effect. Dr. Hopkinson observed in light flint glass an increase of 2 1/2 per cent, in the capacity between 12° and 83° C. And Messrs. Gibson and Barclay showed that there is no appreciable change in the case of paraffin between temperatures —12° and 24° C. Except these, no measurements of the effect appear to have been hitherto published.

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