Abstract
This report deals with the cause of failure of the Kamaishi national iron mill. Japanese engineers throw large raw ore into the furnace under operation, to make it blockade. It was the simplest way to avoid further financial loss, and to conseal serious carelessness of preliminary survey. It was useful to minimize the initial risk of the following private enterprise, which succeeded the iron mill management. And it had big influence in iron manufacture which had grown up to the Japanese key industry in modern ages.
