The reverberatory furnace was developed in Europe between the 17th and 18th centuries. The heat and flames is concentrating at one point by an interior ceiling shaped like a dome to melt cast iron. Firebricks were a key material to build the dome and chimney because the heat and flames reached thousand degrees in the dome.

The Nirayama Hansyaro stands stately at a mountain edge of a countryside. It consists of the four bricks chimneys framed with rusty grid-like iron. The contrast of light brown chimneys and dark brown iron frames color is set off against the green trees and blue sky. The sheer massive structure was awe-inspiring, not only for its historical importance but also its beauty of its design. One of the highlights of the visit was seeing the blast furnace up close.Despite the passing of time, the site is well-preserved and offers visitors a glimpse into the past.

Replicas of the cannons are displayed at the back of the furnace, showcasing the same type of cannon produced at the site. The first cannon was casted in 1858. The casting was carried out at night because the quality of the casting iron was assessed by observing the color of heat that was visible in the darkness. Over the course of six years, the furnace produced nine cannons, although the precise number is unknown. The site provided a unique and valuable window into Japan's technological achievements during the last Samurai era. In recognition of its historical and cultural importance, the Nirayama Reverberatory Furnace was designated a UNESCO World Heritage Site in 2015.

2023.05

The Place Two World Heritages Can Been Seen