木制油罐为圆桶形,容量5吨。制法:用干木头先作成圆形木桶,下底小,上底大。上底留一方口作装油用。在下底附近安一铁管(放沉淀油用),距下底70厘米处再安加油用铁管,两铁管头上都装上龙头。木桶的外边圆周上,安几 Wooden tank is barrel-shaped, with a capacity of 5 tons. System of law: made of dry wood first round barrel, bottom small, large at the end. Leave a square on the bottom for oil loading. In the bottom of an iron pipe near the tube (put precipitation oil), 70 centimeters from the bottom of the security and then with iron pipe, two iron pipe head are fitted with faucet. On the outer circumference of the barrel, Ann