Abstract
The condenser described is one that can be evacuated, filled with dry air, or with a liquid, for the purpose of measurements of dielectric constant and power factor. It is of the cylindrical type, with solid metal electrodes, either platinum- or rhodium-plated, and insulated by means of a single collar of fused quartz. The special features are: rigidity, ease of cleaning, the small volume of liquid required (15 ml.), high insulation resistance, and very low residual inductance and power factor. It is suitable for measurements at radio frequencies, up to say 20 Mc./sec., as well as for direct-current and low-frequency tests.