draft
A current of air in any enclosed space, as in a room, chimney, or stove, caused by the difference in temperature or pressure. 2. A narrow dressed strip along the edges of the face of a squared stone; usually cut with a chisel, but often cut with an ax or hummer in harder stone. Sometimes a draft serves only as a guide for removing the remainder of the face to a given level. 3. A preliminary sketch of a design or plan, especially one subject to revision. Photo from Biddeford, Maine, 2021. (Phillips, 1994)
draft line, margin, draught, drafted margin, margin draft