Carpenter . 43 THE CARPENTER of concrete or wood can be joined in thesame way. The flush key is put in at theback, as a rule, leaving the front joints are often employed to unite on. 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

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