凡取煤经历久者,从土面能辨有无之色,然后堀挖。涂至五丈许,方始得煤。初见煤端时,毒气灼人。有将巨竹凿去中,尖锐其未,插入炭中,其毒烟从竹中透上。人从其下施镢拾取者,或一井而下,炭纵横广有,则随其左右阔取。其上支板,以防压崩耳。(注:这里提到的职业卫生知识是利用大竹 Those who take a long experience coal, from the soil surface can distinguish between the color, then Horiki dig. Tu to Wuzhang Xu, Fang began to get coal. At the beginning of the coal side, poisonous gas scorched people. There will be a giant bamboo chisel to the sharp, its not inserted into the carbon, the toxic smoke from the bamboo in the transparent. People from the next Shi Zan pick up, or a well down, charcoal widely, then with its wide take. Its support plate to prevent collapse of the ear. (Note: The occupational health mentioned here is the use of Otake