. The Street railway journal . ion. The trolley insulators and brackets on this new workwere supplied by the Ohio Brass Company and the Mayer &Englund Company, respectively. The high-tension insulatorsare of glass, made by Knowles. BRIDGES AND CULVERTSA typical construction is shown in 6, which is of a20-ft. arch of steel and concrete, a type erected by theNational Bridge Company. This arch provides for a The ballast is continued over the culvert, sothat there is no abrupt transition from ballast to the rigid foundation afforded by the concrete structure. This is atype of
. The Street railway journal . ion. The trolley insulators and brackets on this new workwere supplied by the Ohio Brass Company and the Mayer &Englund Company, respectively. The high-tension insulatorsare of glass, made by Knowles. BRIDGES AND CULVERTSA typical construction is shown in 6, which is of a20-ft. arch of steel and concrete, a type erected by theNational Bridge Company. This arch provides for a The ballast is continued over the culvert, sothat there is no abrupt transition from ballast to the rigid foundation afforded by the concrete structure. This is atype of construction adopted extensively in recent years bysteam railroads. It has the advantage that there is less difficultyin keeping the track to proper surface and alignment at theends of culverts and bridges than if the ties rest directly onthe unyielding bridge structure. In the latter case a slight set-tling of the ballast at the ends of the culvert causes unevensupport of the track. While this is -true to a certain extent. Pole s+ep ftelephone b
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
