ANIMAL TRAP
Each animal, in falling, resets the trap for the next.
The mouse enters the upper compartment through an open closure and steps on a baited trigger platform, which releases the closure to fall shut behind it. The mouse then walks onto a pivoted trap door, which tips under its weight and drops it into the lower compartment. A wing on the falling trap door pushes the closure and trigger back into their set position. The mouse passes through a one-way door into a removable screened cage, where it remains as an attractant for further animals.
“The cage is preferably removable from the body of the trap, and it has a door to discharge the animals. The cage containing the trapped animals may be submerged in water to drown them, or the door may be opened while the animals are alive.”— Louis Haege, from the specification
And the world did not beat a path to his door.