Engineering and Contracting . ng to paint the end of theconduit pieces with the hot compoundwhere the wrapper is to be applied; thewrappers are rolled up and saturated inthe hot compound and wrapped on whilestill hot. This joint is expensive, but itis believed tliat the results have justifiedits use. In the construction of all lines of con-duit, two or three fiber pipes, dependingupon the importance of the line, are laidin the layer of top concrete for the pur-pose of providing some ready means forarc lights or similar connections from a 202 ENGINEERING-CONTRACTING Vol. XXIX. No. 14. point of
Engineering and Contracting . ng to paint the end of theconduit pieces with the hot compoundwhere the wrapper is to be applied; thewrappers are rolled up and saturated inthe hot compound and wrapped on whilestill hot. This joint is expensive, but itis believed tliat the results have justifiedits use. In the construction of all lines of con-duit, two or three fiber pipes, dependingupon the importance of the line, are laidin the layer of top concrete for the pur-pose of providing some ready means forarc lights or similar connections from a 202 ENGINEERING-CONTRACTING Vol. XXIX. No. 14. point of the line remote from a manholewithout building an manhole orbreaking the line of vitrified pipe. Manholes on trunk lines are all con-structed of large size. A small conduitline, say of twelve ducts, would have a holes except the cables for which they arebuilt. For concrete manholes for junction for distribution boxes, sectional wood-en forms are made in a substantial man-ner, and these forms are used over and. Enq-Contr Fig. 2—Service and Distribution manhole, elliptical in ]ilan, of a miniiniuaof 5x8 ft., and of a suitable depth, de-ponding upon the grade of the conduit, theminimum being 6 ft. The size of the man-holes increases with the size of the line upto a plan section of 7 x 14 ft., wliich wouldbe suitable for the largest line built, namelya line of 81 ducts. Figure 3, shows a Conduits on a Single Street. (i\er again. In this manner the cost offorms has not been material. In the central districts of the city it hasbeen necessary to under drain, during con-struction, practically all lines of conduit,and the presence of tide water and the poorcondition of small house drains in thestreet has necessitated making special pro- ,;. P 1 I P 1 B 1 .. HTl
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherchicago, bookyear19
