Messenger

{
  "id": "MLC-T-MET-010616",
  "term": "Messenger",
  "field": "Meteorology and atmospheric science",
  "definition": "A weight, typically made of brass or another non-corrosive metal, that is sent down a wire or cable to trigger a sampling or measuring device at a specific depth. When the device, such as a Nansen bottle, reaches the desired depth, the messenger is released from the surface and slides down the line. Its impact activates a mechanism that closes the bottle to collect a water sample and reverses the attached thermometers to record the in-situ temperature.",
  "url": "https://mlchart.com/terminology/meteorology/messenger/"
}