Saiseihigen, an instrument for measuring mine workers' disease at the Iwami-Ginzan Silver Mine in Omoricho, Oda City, Shimane, Japan, (i.e., registered as a UNESCO World Heritage Site in 2007) is left as an industrial legacy. A young doctor, Tachu Miya, contrived it at the request of a deputy official of Omori, by 1857, preventive measures such as protection by ventilating the shafts and using masks were introduced. Up until that time, some symptomatic dosage methods for treating pneumoconiosis-syndrome were of primary concern. Even present-day medicine is incapable of healing disease caused by pneumoconiosis. Dust collection prevention, ventilation and health care are also the key present-day measures for this illness. Not only does this imply the studying of Western sciences, but also a modern rationalism means of thought, and attracts attention to the idea of preventive measures (medicine).