. Electric railway journal . rely enclosed in a cast-iron framewhich is fitted with a removable cover, grooved on the underside to fit closely to the edge of the frame and supplied witha suitable gasket. A detachable oil vessel, with insulating lineand barriers between the switch poles, fits around a flange atthe bottom of the frame. The stationary contacts are flaredfingers of drop-forged copper, supported from the contactblocks of the copper current-carrying studs by a heavy flatsteel frame. The studs are supported by and insulated fromthe frame by porcelain insulators. The movable contacts
. Electric railway journal . rely enclosed in a cast-iron framewhich is fitted with a removable cover, grooved on the underside to fit closely to the edge of the frame and supplied witha suitable gasket. A detachable oil vessel, with insulating lineand barriers between the switch poles, fits around a flange atthe bottom of the frame. The stationary contacts are flaredfingers of drop-forged copper, supported from the contactblocks of the copper current-carrying studs by a heavy flatsteel frame. The studs are supported by and insulated fromthe frame by porcelain insulators. The movable contacts arewedge-shaped copper blades hinged at one end. They are ac-tuated by specially treated wooden rods connected to the shaft,which in turn is operated by the crank and handle outside ofthe frame. The construction of the stationary and movablecontacts is such that any burning, due to rupturing the arc, isconfined to the tips of the stationary contact fingers and theupper extremity of the movable contacts, preserving the actual. Oil-Break Pole-Line Switch Installed current-carrying surfaces. This feature of construction insuresclean contact surface and uniform contact pressure withoutretarding the opening of the switch. This switch is built in sizes up to 200 amp at 15,000 method of bringing the leads to the switch varies some-what according to the voltage, but in every case the leads enterthrough porcelain bushings which are protected from theweather by the overhang of the frame. The switches up to4500 volts are designed for use with insulated wire, while forpotentials between 4500 volts and 15,000 volts bushings arefurnished to allow the use of bare wire. 21A ELECTRIC RAILWAY JOURNAL. [Vol. XXXVII. No. 5. LONDON LETTER {From Our Regular Correspondent) Reference has frequently been made in the Electric Rail-way Journal to the improvements which the MetropolitanDistrict Railway has made since electricity was installedas motive power to displace steam, about six years ago
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