@[email protected] to What is this [email protected]English • edit-26 hours ago[Challenge-Solved] glass egg thinglemmy.worldmessage-square26fedilinkarrow-up158
arrow-up158image[Challenge-Solved] glass egg thinglemmy.world@[email protected] to What is this [email protected]English • edit-26 hours agomessage-square26fedilink
minus-square@[email protected]linkfedilinkEnglish29•10 hours agoNot glass, but hardened resin. Used to track littoral currents and drift. Has metal so it can be found later with a metal detector.
minus-squareoce 🐆linkfedilinkEnglish11•8 hours agoA 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/
![[Challenge-Solved] glass egg thing](https://lemmy.world/pictrs/image/54d923bf-4a32-46aa-8ece-9ac9bf5e614e.webp){kind=link}
Not glass, but hardened resin. Used to track littoral currents and drift. Has metal so it can be found later with a metal detector.
Winner. 2 hours!
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/
Fascinating!