VII. Preliminary results of an investigation on the electric conductivity of glass at different temperatures

Abstract

A quadrant electrometer now in use in the laboratory seems to retain its whole charge from day to day; a week’s loss is just perceptible, and may be supplied by a few turns of the replenisher. In a guard-ring electrometer now in use the charge is almost wholly retained from week to week. These qualities are due to the exceptionally great insulation-resistance of the glass employed. At various times experiments have been made in the laboratory at Glasgow to determine the insulation-resistance of different kinds of glass. Of the specimens hitherto examined, those of flint glass have insulated best; and it is hoped that experiments on flint glass now being proceeded with will define the most suitable glass for use in electrometers and other electrical instruments.