. The Bell System technical journal . - grad ^ - ^ ^ • (8) If the contemplated point P for which E is calculated is in a conductor,of resistivity p, where the current-density is w, there exists the addi-tional relation E = pu, in accordance with Ohms law. Of the important contrasting principles enunciated in the sectionentitled The Two Parts of a Voltage, and Their Resultant, principle 1 is an immediate consequence of equation (4) of this appendix, and2 is a consequence of (5) and (6) together. 1 Sometimes called propagated potentials. An Unattended Ultra-Short-Wave Radio Telephone System * By
. The Bell System technical journal . - grad ^ - ^ ^ • (8) If the contemplated point P for which E is calculated is in a conductor,of resistivity p, where the current-density is w, there exists the addi-tional relation E = pu, in accordance with Ohms law. Of the important contrasting principles enunciated in the sectionentitled The Two Parts of a Voltage, and Their Resultant, principle 1 is an immediate consequence of equation (4) of this appendix, and2 is a consequence of (5) and (6) together. 1 Sometimes called propagated potentials. An Unattended Ultra-Short-Wave Radio Telephone System * By N. F. SCHLAACK and F. A. POLKINGHORN FOR several years attention has been directed by Bell TelephoneLaboratories toward determining the characteristics of ultra-highfrequencies and their possible application to the telephone plant. Thisled to the belief that ultra-high-frequency radio might find a usefulfield as an adjunct to the wire telephone plant in crossing naturalbarriers where other means might prove difficult or Map In order to make the new facility practicable for use in as many aspossible of the situations for which it is technically adapted, it isnecessary to keep the total operating costs low. By designing the * Digest of paper presented at Annual Convention of the Institute of RadioEngineers in Detroit, July, 1935. The paper will be published in full in the R. E., October, 1935. 534 ULTRA-SHORT-WAVE RADIO TELEPHONE SYSTEM 535 equipment to include certain features over and above the basic require-ments, it is possible to reduce to a minimum the attendance necessaryto assure continuous operation. Further economies are effected by usingequipment capable of continuous operation out-of-doors. Since ultra-high-frequency radio circuits are normally quite stableand comparatively free from noise, it is possible to omit volume regula-tion and voice operated devices such as are used on transatlantic circuitsat a considerable saving in cost. Under this c
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