All that you'll need is some lumber for the forms, some building paper or felt, some sand, cement, gravel, and a place to mix the concrete. Perhaps a metal wheelbarrow is as good as anything for the purpose. You'll also need your garden hoe for mixing the concrete, a straight-edged board to use as a screed, and a trowel and float to give a final surface to the blocks. If the paving blocks are to be fairly large or if you feel that they may need reinforcing, some wire fencing or scrap wire, such as old coat hangers cut into suitable lengths to fit within the forms, will serve. Other kinds of wire fabrics or small reinforcing rods made especially for reinforcing concrete may also be used, of course. (See Chapter XIII for further information on reinforcing concrete. )

. . . making the forms
The only requisite for the forms is that the wood be straight and true- not warped out of shape-and be reasonably smooth so that the concrete will not stick to it. Oddments of l-inch boards can be ripped down to the height you have chosen for the thickness of the block, cut to the proper length, and their roughnesses smoothed down. It is a good plan to cut several sets of sides and ends simultaneously, clamping the boards together while they are being cut so as to insure that all will be exactly the same dimensions and that all the forms will be even and squared up. Hinges are installed on the outside edges of three corners, and a hasp on the fourth with a wooden peg to keep it firmly closed. Thus, when the block is cast and has set sufficiently, the hasp is loosened and the hinged form can be peeled off easily.