IN research into electrical engineering problems, the analysis of circuit performance and of the related physical phenomena frequently demands the simultaneous recording in correct time relationship of a large number of transient electrical quantities. The Research Department of the Metropolitan-Vickers Electrical Co. Ltd. has recently completed the design and construction of an electromagnetic oscillograph for recording no less than sixteen quantities simultaneously on a single film. Films up to 12 in. wide and 36 in. long may be used. The operation of the oscillograph is initiated automatically. The instrument requires the attention of one person only.