These typescripts consist primarily of answers to questions, prepared by Edison in 1883, relating to central station system technology. Separate sets of questions were devised for meters, dynamos, and engines and boilers. H. Ward Leonard, who helped establish meter departments at several central stations, supplied answers to the meter questions. William S. Andrews, chief electrical engineer for the central stations, supplied answers to the dynamo questions. William D. Rich, superintendent of construction for the central stations, supplied answers to the engine and boiler questions. Also included is a four-page set of instructions by Edison.
Two question books containing answers by Harry M. Doubleday and corrections by Edison have not been selected. The books are labeled "Meters" and "Running of Dynamos." The inscription "November 21, 1883" also appears on the front cover of each book. Manuscript copies of some of the questions and answers can be found in D-83-43 (Document File Series).