[Challenge-Solved] glass egg thing (lemmy.world)

submitted 4 months ago* (last edited 4 months ago) by Landless2029@lemmy.world to c/whatisthisthing@lemmy.world

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[-] klugerama@lemmy.world 37 points 4 months ago

Not glass, but hardened resin. Used to track littoral currents and drift. Has metal so it can be found later with a metal detector.

[-] oce@jlai.lu 15 points 4 months ago

A tracer pebble, interesting. But they seem to be rather made of the same pebble they are supposed to trace. https://southerncoastalgroup-scopac.org.uk/tracer-pebble-studies/

[-] GuyDudeman@lemmy.world 5 points 4 months ago

Fascinating!

[-] Landless2029@lemmy.world 8 points 4 months ago

Winner. 2 hours!

this post was submitted on 04 Feb 2025

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What is this thing?

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