Excerpt from An Approximate Experimental Method for the Analysis of Emf Waves
Pupin passed the current to be analyzed through a noninductive resistance, around the terminals of which he connected his tuning circuit, consisting of a condenser and an adjustable inductance. By a... djusting for resonance with any desired harmonic, and by observing the rise of potential across the condenser by means of an electrostatic voltmeter, it is possible to calculate the amplitude of the harmonic. But even in this case it is necessary to have at hand a relatively wide range of adjustable self - inductances and electrostatic voltmeters with a considerable range of sensitiveness.
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