Carpenter . the cross-tonguing plan, as shown in Figure2, in which a cross-tongue and a V-joint areexhibited. The thickness of concrete is ad-justed on to P as shown. This tongue isoften termed a slip and sometimes is made. KEY TEiR, of wood, and again of metal, according tothe conditions. It is a useful method ofconnecting a number of boards longitu-dinally. Dovetailing the end of a piece of woodwith the end of a stringer of concrete is BBAOBD

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Keywords: ., bookauthorunitedbr, bookcentury1900, bookdecade1910, bookyear1911