Propeeris cannons

Propeeris cannons in the yard of the laboratory of Finland's first gunpowder factory in Östermyra. (Factory founded in 1825).
The smallest cannon was used in the gunpowder test firing. It is said that the balls of the cannon had handles from which the balls could easily be carried back and fired again.
The factory's gunpowder was used, for example, in the Crimean War 1853-1856.

Östermyra is an old Swedish name for Seinäjoki