Special Features
Can be used up to 3000 ft, 900 m, above sea level; double scale also reads 647 to 805 mm at 0.1 mm div; double scaled thermometer reads in c and f; mercury level and white zero pointer are clearly visible in glass cistern; white backing for cistern and meniscus; uniform bore 1/4 inch, 6.4 mm, so capillary depression is constant and taken into account in calibration; tube is in metal casing on 3 by 42 inch wood panel; mercury is included
Adjust level of mercury pool so its surface just touches the white zero pointer which fixes zero point of column; use scale and vernier to read column height; make corrections for temp and gravity as shown in instructions, this will give true barometric pressure at desired location
