Section 30. Impedance Formulae for Short Lines. Resistance of Tubes. Section 31. The Inﬂuence of Electric Capacity. Impedance Formulae. Section 32. The Equations of Propagation along Wires. Ele mentary. Section 33. The Equations of Propagation. Introduction of self-induction. Section 34. Extension of the Preceding to Include the Propaga tion of Current into a Wire from its Boundary. Section 35. The Transfer of Energy and its Application to Wires. Energy-current. Section 36. Resistance and self-induction of a Round Wire with Current Longitudinal. Ditto, with Induction Longitudinal. Their Observation and Measure ment.