Nel.ly

I guess God wanted the little robot to enjoy some sushi 🍣 🥲

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.

gerb was my high school physics teacher. (gerb is short for mr. gerber.) when we were learning about radiation and whatnot, and we touched on radiation poisoning, gerb decided to tell us a story.

when gerb was in high school, he worked in a supermarket. a cashier. there was this one little old lady, mrs. cassopolis, who was a regular. mrs. cassopolis firmly believed that the lasers used to scan her food items would give her radiation poisoning. they tried to explain that’s not a thing. but old cass wouldn’t hear a word of it.

the employees had to punch in every. last. grocery. item. MANUALLY.

and this woman would buy cartfulls of food every week, like any good grandma trying to feed her five children and eighteen grandchildren every time they come for a Sunday visit. so pretty soon, the employees figured out a strategy to get her on her way and get on with their lives.

one or more employees would distract old cass while the cashier would scan all the items he could as fast as humanly possible while she wasn’t paying attention.

now this supermarket had a rewards program for its most efficient workers. the computer would track how quickly the cashiers scanned items, and how many total they scanned in one day, that kind of thing. so one day, gerb’s boss came to him and said “uh,”

“you scanned three hundred items in six minutes last Tuesday during your shift” and gerb says “i recall” “that’s about four times faster than anything i’ve ever seen” and gerb says “yea ok” “jeremy what happened?”

and gerb says