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deng04/26/20258 repliesview on HN

Well, the police also said he bought mercury, which "can be used in switches for a dirty bomb", which is such a stupid thing to say, because a mercury switch is just an old form of a tilt switch. The idea that someone would buy mercury for making his own tilt switch is just so wild, but of course, they just put this BS out there to scare people and justify their completely overblown reaction.


Replies

InsideOutSanta04/26/2025

Mercury can also be used to make felt hats, and criminals often wear hats to disguise themselves, so it's better to be safe than sorry when it comes to Mercury.

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hinkley04/26/2025

There are two or three mercury switches in my house and they were all installed maybe ten years ago.

This case is almost as dumb as the Boston PD got in the couple of years after the Marathon incident. But at least they had ptsd as an excuse.

nosioptar04/26/2025

I've had several analog thermostats that use a mercury tilt switch. I assume it'd be easier to just buy an old thermostat than to make your own switch.

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ohgr04/26/2025

That’s stupid as fuck as they still use mercury wetted relays to this day in some places.

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secondcoming04/26/2025

Are mercury thermometers no longer a thing? My parents had a few while I was growing up in the 80’s

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cjbgkagh04/26/2025

Oh, as switch, I was thinking they were thinking that the mercury would be used in a DIY detonator. I always figured the 'dirty' bomb would need more raw materials rather than less - though the materials wouldn't need to be fissible.

shirro04/27/2025

As a child I bought mercury tilt switches from a tandy store (in Australia) with the intent of making a tilt game controller input for my terrible 8 bit computer (this was decades before acceleromters in game controllers). It was too laggy and had to be debounced and it sat in a box for years. Also had a collection of mineral ores in a drawer near my bed which probably included some dodgy stuff. This case was bullshit and appears to be more about agency politics than public safety.

nandomrumber04/26/2025

Wait until the work out mixing household bleach and vinegar liberates free chlorine.

Chlorine can also be used as a chemical weapon.

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