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(Circulation. 1954;9:276.)
© 1954 American Heart Association, Inc.

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Mechanical Inscription of the Vectorcardiogram

A. CALHOUN WITHAM M.D.¹ WM. F. HAMILTON PH.D.¹

¹ From the Departments of Physiology and Medicine, Medical College of Georgia, Augusta, Ga.

A modification of the vectorcardiographic method of studying electrical events is presented. Simultaneous scalar leads, taken by any vector lead system, are first recorded. The important time intervals, difficult or impossible to read from the loop itself, are measured from these tracings. Proper pairs of the scalar leads can then be rapidly integrated into vector loops by an easily constructed drawing board based on the pulley system. This instrument is described in detail. It is demonstrated that loops so derived do not appear to differ in their important characteristics from electronically integrated loops.