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

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Personal calls allowed only from Oct. 1929.mcment when the two stations are connected, eachhaving previously replied to the call signal. Theinterval between this and the moment when theperson enquired for by the caller arrives at thetelephone apparatus, if he is net pre-advised, mayfrequently cost quite a lot of money.The reason why the personal call is so muchmore rarely used in traffic to Sweden, however,may be found partly in the fact that this formof call is new in most other countries, and thatconsequently the subscribers there are not awareof its existence and value, and partly in that theinternational regulations for taxing personal callswere originally unfavourable in so far that inmany cases the caller had to pay for a call eventhough he did not find the person to whom thepre-advise was directed. From October 1st 1929,however, these regulations are improved so thatno call fee is payable in case the person preadvisedis not at hand.Gradually, as knowledge of the personal calland its advantage to the subscriber becomes moreuniversally spread abroad, the frequency withwhich it is employed will certainly increase. Theexpansion during 1929, in comparison to 1928,is already considerable.In the directionfrom Germany lit Sweden, these calls have increasedduring 1929 by 18 per cent.,from Holland to Sweden, these calls have increasedduring 1929 by 60 per cent.,and from Switzerland to Sweden, these calls have increasedduring 1929 by 197 per cent.Stockholm, February 14th 1930.A. Lignell- 104 -
The Hallsberg Electric Interlocking Signal Plant.By Herman Holmqvist, Signed Engineer.Progress in the field of electric interlockingsignalling deviees has heen rapid in recentyears, and the system applied in the Malmo plant(1925) led to further improvements. The firststep was the Hasselhohn interlocking plant ( 1926),where the mechanical locking system was whollydiscarded, and the levers only connected electrically.As this plant has now heen in use for sometrafficked junction. The plans were therefore revised,and the result may be said to be a compromisebetween the old system and the new whichis of great interest and has worked well in practice.The Hallsberg railway station is a junction oftwo important railway lines, the electrified Stockholm—Gothenburgline and the steam Krylbo—Mjolby line, which latter has double tracks fromFig. 1.years, and has proved perfectly satisfactory fromthe point of view of security and reliability, thetime has been considered ripe to apply the systemto other large installations planned, primarilythen at Lund, Gothenburg, and Stockholm C. Inthe mean time, however, plans for another largeplant, Hallsberg, had been completed in the beginningof 192.S, with the intention of using theelder mechanical locking devices, i. e. allowingonly two train routes to he laid by each lever.But the advantages of the Malum system, permittingtrains from any of the lines to enter or leaveall tracks, were considered desirable at this heavilyOrebro to Hallsberg. On account of the topographicalconditions the Krylbo—Mjolhy line is nota through line, but the tracks from Kuinla andfrom Asbro both enter at the east end of thestation yard. This implies a change round or exchangeof the engines of all the trains at Hallsberg.and the Palsboda track must necessarilybe crossed either coining in or going out. Inaddition there are through carriages to and fromOrebro in a majority of the trains on the StockholmGothenburg line, involving a hurried shuntingof passenger coaches from one train to another.Train traffic goes on all day and night.1 105
Page 1 and 2: VOL. 7 1930Nos. 7 to 12KARL FREDRIK
Page 3 and 4: The Svenska Radioaktiebolaget Audio
Page 5 and 6: the condenser C and the coil L. The
Page 7: showing a continuous large increase
Page 13 and 14: with groups of express trainsbetwee
Page 15 and 16: R 1724 Fig. 5.The new L. M. Ericsso
Page 17 and 18: signal levers that must be moved fo
Page 19 and 20: terminals A and B. 5, and S,' are t
Page 21 and 22: X is the distance to the point refe
Page 23 and 24: Through W r . — W llt (equation 7
Page 25 and 26: ) line 2:where a is the wave-length
Page 27 and 28: or also:I. e.: If the inducing line
Page 29 and 30: φ is the angular velocity and y, r
Page 31 and 32: coupling may b2 distributed along t
Page 33 and 34: Fig. 2. An Automatic Fire Alarm Sta
Page 35 and 36: Fig. 7. Thermo.-contact filled in W
Page 37 and 38: R 1591Fig. 16. Fire Station Apparat
Page 39 and 40: Fig. 20 a. "Svenska Tcatern" lire i
Page 41 and 42: A further demonstration of the risk
Page 43 and 44: New Interlocking and Signalling Pla
Page 45 and 46: is effected automatically by the tr
Page 47 and 48: the old plant, with its three inter
Page 49 and 50: Fig. 2.Fig. 1.Sonic drawbacks or di
Page 51 and 52: The characteristic impedance Z. of
Page 53 and 54: Fig. 4.is taken from this paper, an
Page 55 and 56: Fig. 5.If we measure the impedance
Page 57 and 58: geneity can be calculated from the
Page 59 and 60:
with any greater accuracy than one
Page 61 and 62:
n is, however, a scalar magnitude f
Page 63 and 64:
that ZL is almost equal to Z B and
Page 65 and 66:
Fig. 15.Fig. 16.160
Page 67 and 68:
The air core transformer can, there
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Fig. 1.Fig. 2. Fig. 3.
Page 72 and 73:
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 102 and 103:
Page 104 and 105:
Page 106 and 107:
Page 108 and 109:
Working Reliability and Maintenance
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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
Page 124 and 125:
lation technics is required. Above
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Nos. 7 to 12 KARL FREDRIK WINCRANTZ. Managing Director of ...

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