烘沙箱构造如附图所示,箱的四周均用双立砖砌壁,双立砖之间留有约5公分的夹道,以减低箱壁的散热,两侧各留有三个小排气孔。内部分三隔,下隔是一层薄砖砌成,砖上并泥一层灰沙,第二及第三格均用铅丝网制成,箱设留一烟囱,当炭火燃烧时装炭门必须关上,使火后吸,下层薄砖受顶托之竖砖可交错排列,这样可 Baking sandbox structure as shown in the figure, the box around the double brick wall, double brick between the left about 5 cm of the channel, in order to reduce the heat dissipation wall, left and right sides of each have three small exhaust hole. The inner part of three separated, the lower is a thin layer of brick, brick and mud layer of sand, the second and third grid are made of lead wire mesh, box set up a chimney, charcoal when burning charcoal must Close, so that after the fire sucked, the lower bricks by the backing vertical brick staggered arrangement, so be