Geyser

Geysers are traps that shoot a wall of fire when triggered with wire. This trap does not consume any ammunition, its output being limited to only how frequently it can shoot a wall of fire, which is 4 seconds. Geysers have a range of approximately 20 blocks, similar to Flame Traps. Geysers are found naturally placed in random areas on the Cavern layer, presumably deep enough where lava may spawn. Unlike the Flame Trap, Geysers do not cause the On Fire! debuff.

If a Geyser is blocked by other blocks, including liquids, it will simply pass through it, starting the wall of fire at the first opening. Geysers can face upward or downward (depending on placement), but not sideways. Geysers do not break anything liquid normally breaks.

Tips

 * There currently(or used to be one recently) was a glitch where you could place these near trapdoors and it would duplicate the item rapidly to be able to be sold at a merchant(or other NPC's) for quite large amounts of money.
 * This can be paired decisively with Actuators and Spiky Ball Traps to create the ultimate A.F.K farming machine and home security.
 * Use a Dangersense Potion, Mechanical Lens or The Grand Design to find Geysers more easily.