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Shockingly, however, spending most of your time in close proximity to 500 pounds of liquid mercury is Not Great For One’s Health and tons of lighthouse keepers started to go crazy from the whole. Mercury poisoning thing. Hence why there are a lot of “haunted” lighthouses or wickies that lose it and maybe do a bit of manslaughter.

In a letter written on April 19, 1825, Augustin Fresnel proposed the use of mercury to reduce the friction in revolving lenses. His statement follows: “I propose to float our rotating devices, of the first order, in a bath of mercury, instead of placing them on rollers. This project won't present many difficulties; nevertheless, as I have not put it into execution, I won't require you to adopt it for your first lighthouse.”

Fresnel’s plan for mercury flotation was not put into practice until 1890 when Monsieur Leon Bourdelles, Chief Engineer of the French Lighthouse Service, designed and built a workable mercury flotation system. The mercury bath allowed the lens to operate in an almost frictionless environment and, additionally, allowed the speed of rotation to be dramatically increased.

It mattered for optics reasons.

Under less-than-ideal conditions, you can only see the beam when it’s pointed more or less directly at you. In-between beams you would not be able to see anything. One solution to this was to create multiple beams, and the lenses Mr Fresnel designed usually created 8 beams. But, even still, duration between flashes could be as long as one minute in the old mechanical roller systems.

The nearly frictionless operation of the Mercury suspension system allowed the lenses (large pieces of precisely ground glass weighing several hundred pounds in some cases) to rotate fast enough that they could be redesigned to create fewer (usually 3) beams. Fewer beams from a similar light source will be proportionally brighter, and the gains in speed were sufficient that duration between flashes could still be reduced to as little as 10 seconds.

This was a big upgrade. It didn’t just make the lighthouse signal faster, it allowed them to completely overhaul the lens and derive more visibility from a light source.

One of the most popular theories of trauma says there are three steps.

Escape the trauma and find safety.

Process the trauma.

Consolidate the trauma.

Sometimes this can be a relatively quick process. If you get into a car accident while turning left in a busy city street, you might get trauma symptoms that cause feelings of fear and anxiety when you're driving your car, or travelling by car through a busy city.

"Finding safety" would mean learning to handle your anxiety and fearfulness by re-training your body to seek calm, even when reminded of the trauma. This might include things like breathing or muscle relaxation exercises that actually affect an anxious brain and help you stay centred, as well as slow exposure to situations that are stressful and traumatic so you learn to tolerate them again.

"Processing the trauma" means to look back at what happened that has given you significant psychological symptoms, and re-process those memories and the lessons you took from them so they are less damaging or hurtful. That might be revisiting your memories of the accident until they aren't so painful to think about, or it might be working to be more comfortable with driving again.

"Consolidating the trauma" means that when you've settled those memories, you take your new, healthier understanding of yourself forward into your life. That might make you a more cautious driver, or cause you to be more mindful and value every moment because you've seen how quickly your life can change. It is what you make of it.

When you try to do these steps out of order, that's more of a problem. If you want to dive straight into revisiting your memories of something that happened, but you have no defense against the panic attacks and nightmares that remembering causes you, you're not safe, not so far as your brain thinks. Your brain experiences raw memories of trauma as though it were still happening all around you. You can end up even more traumatized than before, so that even seeing a picture of a car makes you feel like you're back on that street waiting to turn left.

If a trauma is particularly old, complex, or strong, it can take a long, long time before you actually feel safe enough to go back into the memories that haunt you most. That's especially true if you're still in a situation that feels threatening, like if it's your job to drive around downtown. Or in other situations, if your abusive parent is still alive and in your life, or if you're still a member of the group or club you were abused in.