. Electric railway journal . thepantograph under the contact wire. Catenary Suspension Possesses Certain Virtues The advantages of the catenary type of contact wiresuspension over the direct suspension are: (1) High-speed operation without danger of collector leaving thewire. (2) Freedom from hammer blows causing crys-tallization and breakage. (3) Longer spans and a con-sequent saving in poles. (4) Use of porcelain insu-lators. Catenary construction has become fairly well stand-ardized in the last ten years, but local conditions andthe state of the metal market when the material ispurchased of
. Electric railway journal . thepantograph under the contact wire. Catenary Suspension Possesses Certain Virtues The advantages of the catenary type of contact wiresuspension over the direct suspension are: (1) High-speed operation without danger of collector leaving thewire. (2) Freedom from hammer blows causing crys-tallization and breakage. (3) Longer spans and a con-sequent saving in poles. (4) Use of porcelain insu-lators. Catenary construction has become fairly well stand-ardized in the last ten years, but local conditions andthe state of the metal market when the material ispurchased often make it necessary to depart somewhatfrom standard designs. Such matters as types of poles,pole spacing, size and material for messenger and kindof trolley wire must all be thought out carefully witha full knowledge of the conditions under which thesystem is to be operated. The 2400-volt, direct-current electrification of theCanadian Northern Railroads terminal at Montrealhas already been described in the Electric Railway. CANADIAN NORTHERN OVERHEAD CONSTRUCTION—BRACKET-TYPE CONSTRUCTION—LEFT, STANDARD SINGLE-TRACK; MIDDLE, SECTION INSULATION; RIGHT, ON 2-DEG. CURVE December 8, 1917] ELECTRIC RAILWAY JOURNAL 1025
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