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ERICSSON REVIEWVol. XXVIII1 9 5 1RESPONSIB1 I. PUBLISHER: HEMMING J OH A NSSONEDITOR: SIGVARD EKLUND, DHSEDITOR'S OFFICE: STOCKHOLM 32SUBSCRIPTIONS: ONE YEAR $ 1. 5 o ; ONE COPY $0.50CONTENTSpageTELEPHONE EXCHANGESMaintenance of Automatic Telephone Exchanges with 500-line Selectors 2New Developments on L M Ericsson's Telephone System with soo-lineSelectorsL M Ericsson Exchanges 1950730The L M Ericsson By-path System with Crossbar Switches — FundamentalPrinciples 04Theoretical Aspects of Crossbar Exchange Design104.TELEPHONE SWITCHBOARDSPrivate Automatic Branch Exchange AMD i020r14New LB Plug Switchboard ABC 15TELEPHONE INSTRUMENTSNew Domestic Telephone with an Ivory-white Finish 34LONG DISTANCE TETE PHONYRadio Tinks for Power Stations 42VHF Radio Multichannel Carrier Telephone Circuits in Colombia 62Carrier Frequency Circuits in the State Railways Telephone Network 719NETWORK CONSTRUCTIONAn Optimum Law for Telephone Networks 11New Wires for Subscribers' Lines 48MEASURING INSTRUMENTSPhase-Sequence Indicator6oThermotechnical Instrumentation for the Furnaces in Tube RollingMills 73TELESIGNALLING MATERIALAbsence Indicators 20STREET TRAFFIC INSTALLATIONVehicle-actuated, Progressive Road Traffic Signals in Vasteras 23RAILWAY INTERLOCKING PLANTNew Type of Interlocking Plant for the Swedish State Railways 82FITTING MATERIALSievert's Dust- and Watertight Fitting ALAV for Fluorescent Tubes 27WIRELESSNew Ericsson ReceiversS9MISCELLANEOUSTclefonaktiebolaget L M Ericsson's 75-year Jubilee 39Hydraulic Moulding Presses for Plastic Parts Installed in L M Ericsson'sAffiliated Plant at Karlskrona n 1COPYRIGHT TELEFONAKT1EBOLAGETLMERICSSON-PRINTED IN SWEDEN. ESSELTE A13. STOCKHOLM 19 si