Measurement of transients

E. E. F. Creighton: We have had so much difficulty with large spark lags in vacuums that I should like to ask Mr. Terman a question about his measurements. We have found in all sorts of vacuums a considerable dielectric spark lag and he has, I know, tested this with an oscillator where the duration of discharges can be expressed in thousandths of a second. But I should like to know if he has tried out the spark lag, using a frequency say of about five million cycles per second, and a single discharge.