Nos. 7 to 12 KARL FREDRIK WINCRANTZ. Managing Director of ...

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lation technics is required. Above all it is ofgreat importance that all consulting engineersmake themselves thoroughly acquainted withthe properties of the rubber-lead conducting materials.To facilitate this work the consultingfirm Kraftkontrollen at Malmo has, at therequest of Sieverts Cable Works (Sieverts Kabelverk)prepared a paper on installations inplaces exposed to moisture and to risk of fire.This paper from which the abovementionedfigures 15, 16 and 17 are taken, shows clearlythat the rubber-lead conductor system is alwayspreferable both from technical and economicalstandpoint as soon as it is the question of installationin industrial premises or in the offices ofa farm.For a contractor it is much less risk to workwith first-rate material than to handle materialnear the limit of what is permitted. When it isto be tendered for an installation which is intendedto be constructed throughout of first-ratematerial the contractor runs no risk of having toreplace or reconstruct part of it. He can determinehis costs entirely in advance and almostall points of uncertainty are eliminated. In thesame way as a first-rate tailor gets better paymentfor a suit than does a second-rate one, acontractor who always deliveres a first-rate jobcan be well paid.CONTENTS: Karl Fredrik Wincrantz. — The Svenska Radioakticholaget Audio-frequency Generator, with continuouslyvariable frequency Adjustment. — The Use of Personal Telephone calls in Sweden, and in Traffic betweenSweden and other Countries. — The Hallsberg Electric Interlocking Signal Plant. — On Cross-talk between TelephoneLines. — Practical Points about Automatic Fire Alarm. — New Interlocking and Signalling Plant at I.und. —On Impedance and Impedance Measurements as well as a Description of the Impedance Measuring set manufacturedby Svenska Kadioaktiebolaget. — Electric Interlocking Plant at Vanneboda Station. — Porcelain Insulators and InsulatorPorcelain. — The Svenska Kadioaktiebolaget Valve-testing set. — On the Calculation of Delays in an AutomaticTelephone System. — Working Reliability and Maintenance of the L. M. Ericsson Automatic Telephone System.— Lead Covered Rubber Cable Installations.217
Vol. VII. 1930.CONTENTS.Biographical data. Xos. Page.Karl Fredrik Wincrantz 7 to 12 98FireProtection.Practical Points about Automatic Fire Alarm 7 to 12 126Metering Devices.Impedance and Impedance Measurements as well as a Description of the ImpedanceMeasuring Set Manufactured by Svenska Radioaktiebolaget 7 to 12 143Instrument for Grouping Fifteen-minutes Loads in order of their Magnitude ... 1 to 6 60Localisation of Line Faults with the Resistance and Capacity Bridge constructedby the Svenska Radioaktiebolaget 1 to 6 69New Swedish Electricity Meters 1 to 6 86The Svenska Radioaktiebolaget Valve-testing Set 7 to 12 174Miscellaneous.Use of Electricity in Modern Life 1 to 6 48PlantHighLowConstruction.Tension.Lead Covered Rubber Cable Installations 7 to 12 20,>Porcelain Insulators and Insulator Porcelain 7 to 12 167Static Condensers for the Improvement of the Effect Factor in A. C. nets 1 to 6 33Tension.New Swedish Carrier Current Telephone and Telegraph Systems on TelephoneLines 1 to 6 23Railway Signalling.Electric Interlocking Plant at Vanneboda Station 7 to 12 164Hallsberg Electric Interlocking Signal Plant 7 to 12 105Interlocking and Signal Plant at Lund 7 to 12 137Telephony.Calculation of Delays in an Automatic Telephone System 7 to 12 185Organized Service for Information as to Subscribers' Numbers in Large TelephoneExchanges 1 to 6 5Suburban Telephone Traffic 1 to 6 16Use of Personal Telephone Calls in Sweden, and in Traffic between Swedenand other Countries 7 to 12 102Working Reliability and Maintenance of the L. M. Ericsson Automatic TelephoneSystem 7 to 12 201Theoretical.Cross-talk between Telephone Lines 7 to 12 112Wireless.The Svenska Radioaktiebolaget Audio-Frequency Generator, with ContinouslyVariable Frequency Adjustment 7 to 12 99Kurt Lindbtrg, Boktntckeriakliebolaq, Stockholm 1930.
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VOL. 7 1930Nos. 7 to 12KARL FREDRIK
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The Svenska Radioaktiebolaget Audio
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the condenser C and the coil L. The
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showing a continuous large increase
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The Hallsberg Electric Interlocking
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with groups of express trainsbetwee
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R 1724 Fig. 5.The new L. M. Ericsso
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signal levers that must be moved fo
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terminals A and B. 5, and S,' are t
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X is the distance to the point refe
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Through W r . — W llt (equation 7
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) line 2:where a is the wave-length
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or also:I. e.: If the inducing line
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φ is the angular velocity and y, r
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coupling may b2 distributed along t
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Fig. 2. An Automatic Fire Alarm Sta
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Fig. 7. Thermo.-contact filled in W
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R 1591Fig. 16. Fire Station Apparat
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Fig. 20 a. "Svenska Tcatern" lire i
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A further demonstration of the risk
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New Interlocking and Signalling Pla
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is effected automatically by the tr
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the old plant, with its three inter
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Fig. 2.Fig. 1.Sonic drawbacks or di
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The characteristic impedance Z. of
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Fig. 4.is taken from this paper, an
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Fig. 5.If we measure the impedance
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geneity can be calculated from the
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with any greater accuracy than one
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n is, however, a scalar magnitude f
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that ZL is almost equal to Z B and
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Fig. 15.Fig. 16.160
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The air core transformer can, there
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Fig. 1.Fig. 2. Fig. 3.
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F 1584 Fig. 4. Interlocking Machine
Page 74 and 75: Porcelain Insulators and Insulator
Page 76 and 77: at once, but first after some years
Page 78 and 79: R 1751 Fig. 3. Above, Distribution
Page 80 and 81: always had a relatively short life,
Page 82 and 83: Fig. 1.When the D. C. voltages and
Page 84 and 85: orIf the resistance H 0 of the pote
Page 86 and 87: valve not being the same as the ano
Page 88 and 89: -10Fig. 9.sistance W, of a valve, t
Page 90 and 91: non-linear distortion, the magnitud
Page 92 and 93: On the Calculation of Delays in an
Page 94 and 95: By the use of the previously deduce
Page 96 and 97: We, therefore, make an extremely sl
Page 98 and 99: generally thusExample: We supposel
Page 100 and 101: Fig. 2. Delays at free selection of
Page 108 and 109: Working Reliability and Maintenance
Page 110 and 111: TABLEII.The results of the control
Page 112 and 113: Lead Covered Rubber Cable Installat
Page 114 and 115: Husum sulphate mill, hall of paper
Page 116 and 117: ed lead impregnated cable is not re
Page 118 and 119: Fig. 7. Connecting cover for pendan
Page 120 and 121: Fig. 12. Junction box for switch.wa
Page 122 and 123: not be alive any longer than is abs
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Nos. 7 to 12 KARL FREDRIK WINCRANTZ. Managing Director of ...

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