Chicago : Engineering and Contracting Pub. Co. · leaf 335
ring the progress of the work, andwere not expected to be noticeable where thework was under compressed air. As a rein-forcement to the nailing process, a strip of tinwas used, which followed the edge of eachstrip of the outer layer of felt, thus givingcontinuous support to the felt and acting asa… … Fig. 5—Sketch Showing Various Lifts of Concrete in Approach Tunnels. (B) five layers of felt and six of pitch; and (C) ten layers of felt and eleven of pitch.Two general methods were used in making the laps between the successive layers of feltand the successive sections of the waterproofsheet, as…
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