The effect of C${\mathrm{Cl}}_4$ vapor on the dielectric strength of air has been studied at a number of different air pressures up to a maximum of 75 lb./${\mathrm{in}.\mathrm{}}^2$. With air at 25°C and 15 lb. pressure the dielectric strengths of the mixtures relative to pure air ranged from a value of 1.25 for a C${\mathrm{Cl}}_4$ vapor pressure of 5 percent of saturation to a value of 1.80 for a saturated vapor pressure. At higher air pressures the addition of C${\mathrm{Cl}}_4$ vapor gives a greater increase in the absolute value of the dielectric strength, but the percentage increase, relative to the pure air, is less than at 15 lb. pressure.

• Received 14 January 1937

DOI:https://doi.org/10.1103/PhysRev.51.508