. Electric railway journal . gravity, otherwise serious arcing will take OVERHEAD PROBLEMS—SPANS. BRACKETS ANDCURVES BY CHARLES RUFUS HARTE, CONSTRUCTION ENGINEERCONNECTICUT COMPANY Disregard of elementary mechanics is often very evi-dent in support work where spans are drawn so tightat installation that the pole tops pull together untilthere results a sag more nearly equal to that whichshould have been used at the outset. An inclination having 1 ft. of drop for 10 ft. of rungives a pull at the pole of ten times the hanger loadplus the effect of the weight of the span itself. No. 0000trolley w
. Electric railway journal . gravity, otherwise serious arcing will take OVERHEAD PROBLEMS—SPANS. BRACKETS ANDCURVES BY CHARLES RUFUS HARTE, CONSTRUCTION ENGINEERCONNECTICUT COMPANY Disregard of elementary mechanics is often very evi-dent in support work where spans are drawn so tightat installation that the pole tops pull together untilthere results a sag more nearly equal to that whichshould have been used at the outset. An inclination having 1 ft. of drop for 10 ft. of rungives a pull at the pole of ten times the hanger loadplus the effect of the weight of the span itself. No. 0000trolley wire weighs lb. per lineal foot; an ice coat% in. thick all around, which is a maximum value forall but phenomenal sleet storms, brings this up to atotal of lb., and the hanger and ear together weigh Fold Legend Xol«: Spun Attachments to Uiare about 8 above TopbPullovtra Spaced Apprt ildtiarEt Doorslimately f Did of Attachment toInsulatorTrack, Buildiut, Etc-Trolley VHre, SpanB, Eti Anchors HTo Anchors Beyoud Era. Overhead Construction at West Approach of James Street Carhouse, Connecticut Company, New Haven place due to jumping. With a pressure of 45 lb. or 50lb. 1500 amp can be handled by a single shoe. The under-running and the protected over-runningtypes of third-rails have resulted from an endeavor toprovide against snow and sleet storms. Various de-vices are used to cut the sleet on unprotected roads have steel wire brushes which can be letdown by a cam so as to rest on the rail in advance ofthe contact shoes, and are held in contact by springpressure. Others consist of crushing rollers and stillothers of scrapers of various forms. Little trouble isexperienced in obtaining a brush or scraper that willremove sleet in extremely cold weather, but it isalmost impossible to get one that will work satisfac-torily at the time the sleet is falling, for then the iceadheres more firmly to the rail and is more tough andresilient. Crushing rollers followe
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