Siphon barometer

{
  "id": "MLC-T-MET-008906",
  "term": "Siphon barometer",
  "field": "Meteorology and atmospheric science",
  "definition": "A type of mercury barometer consisting of a U-shaped tube with one arm open to the atmosphere and the other sealed, containing a vacuum above the mercury. The difference in mercury levels between the two arms directly indicates the atmospheric pressure. It is a simpler design than the Fortin barometer, often used in barographs.",
  "see_also": [
    "float barograph"
  ],
  "url": "https://mlchart.com/terminology/meteorology/siphon-barometer/"
}