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This book is chiefly concerned with a discussion of the use of the polygraph in disease of the heart. The exposition of the subject is clear, concise and free from unnecessary and bewildering details. The mechanism of cardiac irregularities and the aid to be derived from the polygraph in their interpretation are made plain. The numerous figures, most of them original, are, because of the fine quality of paper employed, of unusual excellence. In brief, we know of no bettter discussion of the essentials of polygraphy than is given by Hay in this small volume.
Since the publication of the first edition twelve years ago, the electrocardiograph has largely supplanted the polygraph. Some even go so far as to say that the polygraph is now of historical interest only. But because of its relative cheapness and its portability, the polygraph still remains the more serviceable instrument for the practitioner. Hay
GRAPHIC METHODS IN HEART DISEASE.. Arch NeurPsych. 1921;6(1):115. doi:10.1001/archneurpsyc.1921.02190010122014