A precision instrument for accurate barometric pressure measurement, suitable for laboratory corrections, weather observations, and industrial applications such as factories, mines, and power plants.
Mercury cistern constructed on the Fortin principle, adjustable to zero via an ivory indicator.
Annealed glass barometer tube mounted in a brass casing with metrical (mm) and English (inch) scales from 640–810 mm, vernier reading to 1/100 inch and 1/10 mm.
Mercury level adjusted with a knurled screw at the casing base; allows thermal expansion.
Corning glass tube and scale covers for durability.
Mounted on polished wooden board with metal thermometer.
