Tezutsu-hanabi

Tezutsu-hanabi (手筒花火) is a type of traditional Japanese fireworks using a flamethrower-like handheld projector.

[1] The Kyūchū hisaku (宮中秘策) of 1741 states that tezutsu-hanabi were presented to Tokugawa Ieyasu at Edo Castle in 1613, just before the Siege of Osaka.

It is believed that the gunnery corps of the Tokugawa clan brought back knowledge of pyrotechnics when they returned to Mikawa Province in the early 17th century.

Structurally, the projector is a roughly 100-80 centimeter long cartridge made of mōsō bamboo reinforced with rope and packed with a mixture of slow-burning gunpowder and iron powder.

At the end of the performance, the projector is hefted and flipped around as the bottom explodes in a brief secondary ignition called a hane (跳ね).