Anvil firing

Anvil firing (also known in the USA as an anvil launching or an anvil shooting) in the USA is the practice of firing an anvil into the air with gunpowder. In the UK this is where black powder is filled onto the top of the Anvil and ignited. If the Anvil did not shatter it was deemed safe to use.

Typically, two anvils are used: one as a base (placed upside down), and another one (also known as the "flier") as the projectile (placed right-side up, atop the base). Alternatively, a single anvil can be fired from a stone base. The space formed by the anvil's concave base is filled with black powder (not modern gunpowders, which have much higher energy densities) and a fuse is made to project out. The fuse is lit, and the resulting deflagration (the rapid combustion of the powder rather than detonation) sends the projectile anvil several feet into the air.

An alternative method is to place the bottom anvil right side up, and fill the hardy hole with black powder. A torus or washer, often made from a playing card, is placed over the hole, with a space for a fuse or powder trail. The top anvil is placed upside down, face to face with the bottom anvil.

Anvil firing was once commonly performed in the Southern United States as a substitute for fireworks during celebrations. One such noteworthy celebration was held on the day the state of Texas voted to secede from the Union. On February 23, 1861, Texas Ranger and prominent Union supporter, Thomas Lopton Campbell Jr., was held captive and forced to "fire the anvils" in the streets of Austin.

...
Wikipedia