Executioner from Hell

The Titan Guillotine is a large device invented by Hange Zoë for the purpose of killing Titans without the need for soldiers fighting them or the use of cannons and other resources.

Design
Hange's Titan Guillotine was first installed in the southern gate of Trost District. It is comprised of two parallel walls grafted onto the outside of the gate with bars between them to prevent Titans from slipping in. There is a large pulley system fixed atop the walls that includes a large, heavy log that rests on top of the wall and is suspended from the pulleys by chains that are pulled by horses.

System
The system of the Titan Guillotine involves a soldier standing between the two small walls on foot. This draws in near by Titans and once one of the Titans puts their head between the walls to try and get close to the soldier, a command is given and the weighted log is dropped at a high speed on its nape, killing it. The log is then pulled back up into position by the horses and once the Titan's body has evaporated enough, they rerun the system.

Purpose
The Military intends to install Hange's Titan Guillotine all over the walls and use it to slowly kill off all the Titans within Wall Maria in preparation for the time that they are able to take it back.

Trivia

 * The Titan Guillotine is the first non endangering way to kill Titans that has ever been devised and successfully put into action.