Human accuracy: Multi-recorder for lightning phenomena and switching

The object of this paper is to describe a new instrument which will record the time to the second of a phenomenon of any kind that can be made to close an electrical contact. Besides recording whether a phenomenon is starting or stopping, a printed record is made of the day of the week, a.m. or p.m., the hour, minute, and second. The highest number of records put on a sheet by a single one of these instruments so far is thirty. The instrument is capable of recording a movement of all of its pencils or type wheels simultaneously, or the movement of any lesser number. Every record shows the position of every type wheel whether it moves or not. The instrument records only to the nearest second but in case of successive discharges during a single second their relative precedence is noted by giving them successive prints of the same second. In this manner the recorder will split a second into about four parts. The manner of operation will be described later.