English: An explosive contraption from the Huolongjing. The device is operated by steel wheels contained in two boxes. When pressed, the wheel boxes are supposed to ignite a spark reaching the buried gunpowder packages, setting off the explosion.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.