San Francisco : Architect and Engineer, Inc · leaf 397
TELEPHONE BUILDING l*f^SM^^M RIGHT Blowing out steelcaissons with airand water jetsprior to settingreinforcing steeland pouringconcrete. BELOW … lowering a pipe into the tubesthrough which an air and waterjet could be admitted was involvedin cleaning the tubes, more fore-thought and arrangement of equip-ment was required to restrain andcatch the ejected material. Theplan adopted was to use a bonnetor deflector put over the top of thetube…
Architecture · Building
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
