Dados (wide slots cut in a board that another board fits into) are usually made with a router or dado blade in a table saw. But if you lived before either of those were invented, you could use a dado saw to cut both sides of the slot, and then chisel out the center. The saw is designed to be held at both ends, and used very carefully to cut just a short distance down into a flat board (which may be much longer than the saw blade).
Location: Box 12
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