. Practical concrete work for the school and home. tted lines d. If the form were dividedinto eight parts then each part would be similar to segment gwhich could be withdrawn in the direction of arrowhead withoutinjuring the edges of projections as shown by line li parallel tothe face of this projection. The foregoing examples illustrate the underlying principlesof correct and incorrect methods of dividing forms for practi-cally all circular concrete objects. Other objects will requireonly a variation of these principles, to conform to the shape ofthe object. PRACTICAL CONCRETE WORK 103 Plate
. Practical concrete work for the school and home. tted lines d. If the form were dividedinto eight parts then each part would be similar to segment gwhich could be withdrawn in the direction of arrowhead withoutinjuring the edges of projections as shown by line li parallel tothe face of this projection. The foregoing examples illustrate the underlying principlesof correct and incorrect methods of dividing forms for practi-cally all circular concrete objects. Other objects will requireonly a variation of these principles, to conform to the shape ofthe object. PRACTICAL CONCRETE WORK 103 Plate 3 illustrates details of a form for solid concrete block9 inches square by 10 inches high. This form may be built of 1or IJ/^ inch lumber. The ends of the sides o should be ends of the sides b have cleats nailed to them as shown at cleats hold sides a securely in position while concrete is beingplaced in the form. Sides b are held in position either by metalclamps and wedges, or by any one of the numerous commercial g round rod. V^edgePlan. c^ i / round rod Ui £ Elevation. PL.^TE 3 clamps such as used by wood workers for holding pieces togetherwhile gluing. When assembling a form the four sides are set upon a workbench or table to which blocks d are nailed in positionto hold the form square. When blocks d are attached to the work-bench, nails should not be driven all the way in. This will permit 104 PRACTICAL CONCRETE WORK pullini^ them easily witliuiit haniniering or blows that would in-jure the concrete. Cores.—A form such as shown can be used for the ex-terior form of a square flower box. Of course a core or insideform is then required. Although the core may be made of asolid block of wood tapered so as to permit withdrawal, this is
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