Lambrecht's polymeter

{
  "id": "MLC-T-MET-006853",
  "term": "Lambrecht's polymeter",
  "field": "Meteorology and atmospheric science",
  "definition": "A historical meteorological instrument that combines a thermometer and a hair hygrometer to simultaneously indicate air temperature and relative humidity. The device displays these two values on a single dial or chart, often with a third scale showing the dew point, which is derived from the other two measurements. This instrument provided a convenient, all-in-one tool for weather observation before the advent of modern electronic sensors.",
  "url": "https://mlchart.com/terminology/meteorology/lambrecht-s-polymeter/"
}