A continuous loop is always a good idea to automate machinery. It allows you to deliver a spark in a time set by the length of wire. The only problem, however, comes when you try to add the spark to the loop. What happens is that you get two sparks, one traveling in each direction, and when they meet the half way point, they collide and cancel each other out. So, I propose that we have a diode, which makes sure that an electrical spark only flows in one direction.

Here's an example of what I mean

Oh; well that works well