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Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

riedel.wtf

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Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#21

Post by pvaldes »

Animats wrote: post #6
yosito wrote: post #2

I've gotta give them props for the persistence. I would have just given up and bought a new iPhone. It's impressive that the iPhone survived the whole ordeal, without even turning off. And the amount of stuff they found makes me wonder why people don't use magnets on strings to search for lost things in European canals more often. Could be an interesting hobby.

Why people don't use magnets on strings to search for lost things in European canals more often. Could be an interesting hobby. Magnet fishing is a thing. There are web sites for it. Amazon sells kits with very strong magnets and ropes.

Maybe is the combination of rust iron, salmonella, chilling cold water and skin cuts.

Aren't such big magnets an hazard for anything digital near them? Everything has a computer inside now, starting by cars.

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#22

Post by anfractuosity »

magoon wrote: post #16

I’m surprised to hear that bluetooth, GPS, and cellular don’t work in water. I wonder what’s the science behind this.

That's a good question, submarines use very low frequencies for communication, so I assume bluetooth/GSM might be pretty attenuated by the water? But also it might have turned off due to the water shorting something?

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#24

Post by kajecounterhack »

anfractuosity wrote: post #22
magoon wrote: post #16

I’m surprised to hear that bluetooth, GPS, and cellular don’t work in water. I wonder what’s the science behind this.

That's a good question, submarines use very low frequencies for communication, so I assume bluetooth/GSM might be pretty attenuated by the water? But also it might have turned off due to the water shorting something?

Signal attenuation is correct.

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#25

Post by riekus »

yosito wrote: post #2

I've gotta give them props for the persistence. I would have just given up and bought a new iPhone. It's impressive that the iPhone survived the whole ordeal, without even turning off. And the amount of stuff they found makes me wonder why people don't use magnets on strings to search for lost things in European canals more often. Could be an interesting hobby.

My 12 year old niece fished a handgun out of a canal couple months back, that is pretty uncommon heren in the Netherlands

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#26

Post by detaro »

magoon wrote: post #16

I’m surprised to hear that bluetooth, GPS, and cellular don’t work in water. I wonder what’s the science behind this.

water absorbs electromagnetic waves, especially high frequency ones. That's why your microwave heats things :D

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#27

Post by anfractuosity »

kajecounterhack wrote: post #24
anfractuosity wrote: post #22

Earlier quoted context omitted.

That's a good question, submarines use very low frequencies for communication, so I assume bluetooth/GSM might be pretty attenuated by the water? But also it might have turned off due to the water shorting something?

Signal attenuation is correct.

Are different frequencies attenuated differently then out of interest in water?

Re: Using a magnetic string to fish for a lost iPhone 12 in a Berlin canal

#29

Post by kajecounterhack »

anfractuosity wrote: post #27
kajecounterhack wrote: post #24

Earlier quoted context omitted.

Signal attenuation is correct.

Are different frequencies attenuated differently then out of interest in water?

Different frequencies are attenuated differently, yes. So like, green laser vs red laser will have different max distances under water.

Fun fact, salinity of water also affects transmission. So rate of transmission in a lake vs ocean is also going to be different.

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