Following is part XXIV of the listing of241 papers presented. Mobile Tactical Communications and Queueing Theory. By N. T. Thomopoulos, R. M. McManamon and R. v. janc. Harmonic Radar for Vehicular Headway Control and Collision Avoidance. By J. Shefer and R. J. Klensch. Technical Requirements for the Designing of Wayside Communication Systems. By A. S. Hu. Gas Tube Arresters. By E. J. Cohen, J. B. Eppes Jr. and E. L. Fisher. Determining Peak Currents that Cause Ground Potential Rise. By F. B. Hunt. Audio Tone Relaying Tests on Telephone Channels in the Presence of Induced Voltage. By L. R. Berke, W. W. Geer Jr. , M. Parente and T. L. Berri.