. Electric railway journal . , andat Schanz, 2 miles from the western boundary of Austria. TRANSMISSION LINE The transmission line is carried principallyon the poles of the overhead contact line and consists oftwo wires each of 35 sq. mm ( approximately No. 2 B. & S.) 34 ELECTRIC RAILWAY JOURNAL [Vol. XLII, No. i. section. As part of it is in a district which is difficult ofaccess in winter, great care was necessary in design andconstruction. On this account a portion of the line consistsof three wires, two of which are usually in service, the thirdserving as a reserve. The latter
. Electric railway journal . , andat Schanz, 2 miles from the western boundary of Austria. TRANSMISSION LINE The transmission line is carried principallyon the poles of the overhead contact line and consists oftwo wires each of 35 sq. mm ( approximately No. 2 B. & S.) 34 ELECTRIC RAILWAY JOURNAL [Vol. XLII, No. i. section. As part of it is in a district which is difficult ofaccess in winter, great care was necessary in design andconstruction. On this account a portion of the line consistsof three wires, two of which are usually in service, the thirdserving as a reserve. The latter can be switched in as re-quired to replace a defective wire. As a protection against stresses caused by the rapid passage of the current col-lector. The Allgemeine company found that a special formof disk link suspension insulator was the only suitable typefor these conditions. As is well known, porcelain canbe regarded only as a perfect material for compressionstrains because it possesses little tensile strength and has. Mittenwald Railway—Plain Catenary Suspension and Bridge at the Scharnitz Station atmospheric discharges a copper wire is mounted abovethe high-tension line on the tops of the poles and isgrounded to the depth of ground water at each pole. Thesteel lattice poles employed exclusively for carrying theline are erected 262 ft. apart. Insulators for transmission lines are as a rule subjectedto comparatively little mechanical strain, since severe vibra- no flexibility. These conditions can be met satisfactorilyonly by the link suspension insulator, which is not subjectedto a tensile or bending strain in any part. The insulatorselected is especially suitable for anchoring the contactline, and although it weighs only lb., it possesses abreaking strength of 17,160 lb. to 17,600 lb. A fundamental difference as compared with other sus-
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