. Electric railway journal . ils on the pole pieces. No tripping current iscarried through the revolving parts. When the con-tacts have been closed they are firmly held in that posi-tion until tripping occurs, by the armature of a holdingcoil connected in series with the contacts, the trip coilof the air or oil break circuit breaker and an auxiliaryswitch which opens when the breaker is tripped. Thisinsures current on the trip coil continuously until thecircuit breaker opens, and prevents flashing at the relaycontacts. The values given in vertical columns 1 to 10 on theindex plate are the time
. Electric railway journal . ils on the pole pieces. No tripping current iscarried through the revolving parts. When the con-tacts have been closed they are firmly held in that posi-tion until tripping occurs, by the armature of a holdingcoil connected in series with the contacts, the trip coilof the air or oil break circuit breaker and an auxiliaryswitch which opens when the breaker is tripped. Thisinsures current on the trip coil continuously until thecircuit breaker opens, and prevents flashing at the relaycontacts. The values given in vertical columns 1 to 10 on theindex plate are the time delays which will be obtained atthe different degrees of overload, represented in theTimes Current Tap Setting columns at the extremeright and left sides of the index plate. The factors ap-pearing in the Times Current Tap Setting columns,when multiplied by the current tap setting, representactual secondary current values. The contacts, which are made of a special non-cor-rosive metal, are designed for use on direct TIME LIMIT OVERLOAD RELAY WITH COVER REMOVED They will carry 18 amp. momentarily without damageto the contact surfaces. A thermostatic device withinthe relay compensates for any variations in room tem-perature. This relay is being furnished in two styles, one for25-cycle and one for 60-cycle circuits. Although the prin-ciple of operation and the inherent characteristics arethe same in both relays, the relays themselves differonly in slight details of construction. 902 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 17 NEWS OF ELECTRIC RAILWAYS MINNEAPOLIS VALUATION FIGURES PRESENTEDCity Engineer Presents Figures in Connection with Fran-chise Renewal City Engineer F. W. Cappelen, in a report to the CityCouncil of Minneapolis, Minn., says that a fair valuationof the Minneapolis Street Railway is $25,914,308. This isthe physical value, the report says, together with capitalinvested in the development of the property and presentcommercial value of water power lease
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