Fortins Barometers

We offer Fortins Barometers[1015]. Fortins barometer (precision form) this is an instrument for making precise barometric pressure correction in laboratory operation. It is also used in weather observations, factories, mines and power plants. The mercury cistern is constructed on the fortin principle adjustable to zero, with zero indicated by ivory point in the cistern. The glass barometer tube is carefully made and annealed and mounted in brass metal casting. The metric and english system scales read from 25? to 32? and from 640 to 810 millimeter with vernier reading to 1/100 inch and to 1/10 millimeter. The mercury level is adjusted by means of knurled screw mounted at the bottom of the casting. When the knurled screw is turned all the way into the casting, mercury fills the entire system and the tube accepts for a very small volume to allow for thermal expansion. The barometer tube and scale covering glass are made from corning glass. The barometer is mounted on a polished wooden board fitted with metal thermometer. Supplied without mercury. A. Barometer tube (borosil glass) made of heavy wall corning glass capillary tube with ivory point, suitable for fortin barometer of cat. No. 1015. Dimension of the tube of 34? in length and 8 to 9mm in diameter. B.deluxe model 10mm borosil glass tube c. Spare leather bag suitable for above barometers of cat. No. 1015