Lighthouse keepers constantly went nuts due to mercury poisoning from the fresnel lens lamps they used combined with isolation. It was a major issue for the USCG until a doctor took a look at the huge pool of mercury sitting under the lens.
fact
Lighthouse keepers constantly went nuts due to mercury poisoning from the fresnel lens lamps they used combined with isolation. It was a major issue for the USCG until a doctor took a look at the huge pool of mercury sitting under the lens.