Chicago : Engineering and Contracting Pub. Co. · leaf 276
he roll to preventwater from passing through it. A strong steelband is fastened to the rear end of the car-rier to which is fastened the bright chord. Ahatch box designed for use in subsequentcleanings of the main is placed in this openingnext to the gate valve. The cover of the boxcan be removed… … Fig. 3—Section of Six Inch Water MainBefore Cleaning, Louisville, Ky. The chord is passed over a small reel, mountedin the hatch box, while it is going throughthe main attached to the carrier. This holdsthe chord in the center of the pipe. After thechord is attached to the carrier, the hatch boxis…
Buildings
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