Hagi Reverberatory Furnace
Ruins of an Edo-period test furnace for casting cannons.
The Hagi Reverberatory Furnace, known in Japanese as *Hagi hansharo*, consists of the remains of a furnace built during the Edo period by the Chōshū Domain. It is located in what is now the Chintō district of Hagi, a city in Yamaguchi Prefecture within Japan's San'yō region. In 1924, the site was recognized as a National Historic Site, and later it became part of the UNESCO World Heritage listing for the Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining, granted in 2015.
During the Bakumatsu period, the Tokugawa shogunate grew worried about foreign warships entering Japanese waters, fearing they might forcibly end Japan's isolation policy or launch an invasion. In response, many feudal domains were told to build coastal defenses with artillery at key points, and the shogunate made late efforts to modernize its military with Western weapons. Chōshū Domain decided to create a facility for casting Western-style iron cannons and sent a technical team to Saga Domain in July 1855. Saga Domain, a leader in this area, already had a working reverberatory furnace but was unwilling to share much information. The next year, Chōshū sent another team to Saga, this time asking to build a new gun mount invented by Chōshū engineers. Through negotiation, the Chōshū team was allowed to sketch the reverberatory furnace and brought that information back to Hagi, where a test furnace was built right away. This test furnace is recorded as operating until 1858, but a full-scale reverberatory furnace was never finished.
The site holds the remains of the furnace chimney, which stands 10.5 meters tall. The upper part is made of brick, while the lower part uses andesite and red clay. About five meters from the top, the chimney appears to split into two branches, but these are actually two separate chimneys placed side by side. Two hearth remains have been uncovered, and it is believed the west hearth was the main one used. When casting cannons, a rotating flat cone, or frustum, was used to hollow out the barrel, but no evidence of irrigation channels needed for a water wheel to power such a device has been found. Combined with the lack of any historical records showing that cannons were produced here, it appears this furnace was used only for testing, not actual production. Like the Nirayama Reverberatory Furnace in Izunokuni, Shizuoka, the de
- type
- Ruins of a reverberatory furnace
- period
- Edo period (Bakumatsu period)
- location
- Chintō neighborhood, Hagi, Yamaguchi, Japan
- builder
- Chōshū Domain
- designation
- National Historic Site (1924), UNESCO World Heritage Site (2015)
- height
- 10.5 meters (chimney)
- scale
- 70 percent scale model of a design from a Dutch book
Lore & Background
During the Bakumatsu period, the Tokugawa shogunate grew alarmed by incursions of foreign warships into Japanese waters, fearing they would end Japan's isolation policy or invade. Chōshū Domain decided to build a facility to cast Western-style iron cannons. In July 1855, it dispatched a technical team to Saga Domain, which already had an operational reverberatory furnace, but Saga was reluctant to share information. A second team was sent the following year, and through negotiations, the Chōshū team was allowed to sketch the furnace. They returned to Hagi and immediately constructed a test furnace, known to have been in operation until 1858, but a full-scale reverberatory furnace was never completed.
The site contains the remnants of the furnace chimney, 10.5 meters high, with an upper part of brick masonry and a lower part of andesite and red clay. About five meters from the top, it appears divided into two branches, but these are actually two independent chimneys side-by-side. Two hearth remains have been excavated; the west hearth is believed to have been mainly used. No trace of irrigation channels for a water wheel to power a cannon-boring device has been found, and no historical records exist of any cannon produced at this site, indicating the furnace was used for testing only.
Reader's Guide
The Hagi Reverberatory Furnace represents a key effort by Chōshū Domain to modernize its military technology during the Bakumatsu period, a time of foreign threat and domestic change. Though the furnace was never used for full-scale cannon production, its construction reflects the domain's determination to acquire Western industrial knowledge despite reluctance from other domains. The site's designation as a National Historic Site in 1924 and its inclusion in the UNESCO World Heritage listing 'Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining' in 2015 underscore its importance as a tangible link to Japan's early industrial experimentation. The furnace's design, taken from a Dutch book and built at 70 percent scale, illustrates the transfer of Western technology through limited channels, such as the Dutch trading post at Nagasaki. Today, the ruins serve as a preserved example of early Japanese efforts in iron casting and military self-sufficiency, offering insight into the technical challenges and limitations faced by domains like Chōshū before the Meiji Restoration.
Did You Know?
- The furnace was built as a 70 percent scale model of a design from a Dutch book, Het Gietwezen in's Rijks Ijzer - geschutgieterij te Luik.
- No historical records exist of any cannon produced at this site, indicating it was used only for testing.
- The chimney is 10.5 meters high, with an upper part of brick masonry and a lower part of andesite and red clay.
- The site is about three minutes by car from JR West Higashi-Hagi Station.
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