General Networks for Central Terminals in Electrocardiography and Vectorcardiography
Nathan Marchand, Stanley A. Briller, Charles E. Kossmann · Circulation · 1955
A method is described for obtaining true orthogonal components of the heart vector by measuring the differences in potential between resistor networks which are connected to the limbs and to the back. The values of the resistors in the networks are determined by solving equations into which the scalar coefficients for the limbs and for the back are inserted.