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Show HOLLOW WALLS OF CONCRETE j i Hi A.MNCMtlVfMlCa' 'iihil t'MvN6tt'cK-Tt 1 '''rtHKW IMNfrOkl ' r I 6. C0NCa(TI fOUNMTIOH ! i I CRosTssrcTiehi It I not a difficult problem to construct con-struct hollow wall of concrete so th Inner air space I large enough to permit per-mit of comfortable working. Tha ao-oompanylng ao-oompanylng dealgn ahowa how a wall may ba readily built of two walls each throe In.hea thick and an air space between them of ten Inrhra. The only trick la to get out the plank of the Inner In-ner form, and thla la readily dona when tba Inner atuddlng of two by li Inch I beveled o that It may readily ba twlated to loosen the planking. It hould not be struck but gently and aventy twisted, whan It will raleasa tha planking. Tha tie acroaa tha wall are beat mad ot vitrified paving brick, If they can be gotten II or 1 Inchea long; It tbey cannot ba had of that length the Inner form may ha narrower. Wlrea wblch ahould b galvanised hold the outer atuddlng together; the wlrea are cut and remain Imbedded la tha wall. If no paving brick are to b had good band-burned drala tllea may make tba connection between tha two walla, or ahort places ot Iroa rodA or even vary heavy galvanised wlrea aay about No. 1 slse. cut and tha and bent over. Such a wall la built up ( few feat at a time and allowed to aal and harden somewhat before tba la nar forma are taken out And raised up. It will pror vary cold reetstanl and damp-raalataat The Inner Bur face will ba plastered ; tha outer ui faca may b simply roughened A llttla with a tool made for that purpoaa ot washed with th proper acid to makt It rough and of uniform aurfaca, or It may alo be plaaiered, though thli doe not usually glv ao pleasing urfac as the rough one. Of course, at top and bottom In wall will be hollow. The two walli are bridged ovar for lha top, tllea ot lata being uaed, taking earn that they do not cover mora than about one Inch of lha wall at tba Inner aide. |
