"Color vectorcardiogram" recorded with a specially designed apparatus for spatial representation by coloring.

Using a vectorcardiogram only in the horizontal plane, spots of the vector loop were colored according to a specially designed apparatus, so that changes in height of the spots could be indicated by differences in those colors. Consequently, the spatial vectorcardiogram was represented by a single, colored graph, i.e. a "color vectorcardiogram." By the use of this graph, an attempt was made to facilitate the understanding of vectorcardiography for common clinicians. The colors corresponding to the heights of the deflections in the Y axis were chosen as follows: in a level of the origin or zero point of the vector loop, yellow; above the origin, reddish colors; and below the origin, bluish colors.