Modern cathode-ray oscillograph for testing lightning arresters

THIS oscillograph was designed to meet the specialized needs of a group that uses the cathode-ray oscillograph as the principal tool in the study of transients in-lightning-arrester development. The instrument is desirable for many purposes, especially those requiring very high writing speeds in connection with nonrepetitive transients where photographic records must be obtained. Other requirements of primary importance in the design were convenience of operation; accuracy of measurement of current, voltage, and time; accuracy of the timing; and linearity and rectilinearity of the plate pattern.