. Public works . brought out many typesnf underground ducts for the carryingof all kinds of transmission lines. Vit-rified tile conduit buried in concreteclaims a wide use and many advant-ages. Vitrified salt-glazed duct af-fords adequate protection againstmoisturergasr-&Fer-wate-F-afld tempera-ture eflEects and also against the in-sidious electrolytic destruction due to 400 MUNICIPAL JOURNAL Vol. XXXVII, No. 12. contagious currents. .American Vitri-fied Conduits, manufactured by theAmerican Vitrified Conduit Broad-way-Maiden Lane Building, Xew claimed to embody all the essentiala
. Public works . brought out many typesnf underground ducts for the carryingof all kinds of transmission lines. Vit-rified tile conduit buried in concreteclaims a wide use and many advant-ages. Vitrified salt-glazed duct af-fords adequate protection againstmoisturergasr-&Fer-wate-F-afld tempera-ture eflEects and also against the in-sidious electrolytic destruction due to 400 MUNICIPAL JOURNAL Vol. XXXVII, No. 12. contagious currents. .American Vitri-fied Conduits, manufactured by theAmerican Vitrified Conduit Broad-way-Maiden Lane Building, Xew claimed to embody all the essentialadvantages of the material. The mak-ers guarantee the -duct against de-terioration of time. The duct is claim-ed to have high insulating qualities andto give protection against electrolysisand induction. This duct is joined bydowel pins of special design, calculatedto insure perfect alignment and to pre-vent shifting during laying or afterand. in combination with the wrapperwhich is used around the joints, to. TWO AXD FOUR-WAY DUCT. make a true connection. The frictionalresistance offered by the interior towires and cables is claimed to be uminimum. The duct is held to need norepairs or renewals; to be easily ac-cessible and to have initial strengtnagainst breakage. Various combinations of single andmultiple ducts are made for all re-quirements as shown in the illustra-tion. The standard length for mul-tiple conduits is three feet, and shortlengths furnished for fitting into man-holes are six to eighteen inches. Sin-gle duct has a standard length ofeighteen inches with short sections ofsix, nine and twelve inches. Specialtypes of any design may be obtained—a special round-hole con.^truction beingused in the walls of the Xew YorkSubway system. The standard two-ductconduit was used by the citj- of Russia, in the completeunderground installation of wires. MOTOR-GENERATOR SETS,For Transforming Current Receivedfrom Central Stations for Lighting,Power and Transportati
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
