SOLD-This is a late 19th century pocket Balloonist or Alpinist Barometer Altimeter Compass and Thermometer compendium or weather station consisting in a silver altimeter dial, a small thermometer and compass made by well known scientific instruments maker Negretti & Zambra London. The barometer scale goes from 15-31 inches and the altimeter scale ranges from zero to 20,000 feet adjusted by the upper bezel. The thermometer shows the temperature in Celsius and Fahrenheit degrees and goes from 20 F to 130 F degrees and -10 C to 60 C. The wonderful Singer's patent mother of pearl compass has a on and off lock on the top and shows the direction of magnetic North.
The body of the devices is made from gilded brass with minimal wear and tear. The devices comes in a well fitted leather and wooden case with excellent green velvet liner.
What makes this altimeter rare is the high altitude range of the dial which is very hard to find for such a small device.
The device is still showing differences in the barometric pressure and altitude variation.