Abridgment of oscillographs for recording transient phenomena

Oscillographs which automatically record amplitude, wave form, frequency, duration, and the time of any electrical disturbances for which they are adapted as developed for recording transient phenomena are described. Two instruments are described or recording very short or very long transients; they may be used in combination. At power frequencies, satisfactory records may be made on films or sensitized paper with a two-watt lamp. The instruments and their performance are illustrated by photographs and oscillograms.