Really nice two sided cased Tycos, Short & Mason pocket instrument. One side is the compensated barometer with rotating altitude adjustment up to 12,000 ft. The other side reveals a compass and thermometer (Fahrenheit scale). Instrument condition: Very good; the bezel for the barometer turns easily; the temperature looks accurate (it’s a thin line tube so you have to train your eye); the compass unlocks easily and works; we tested the barometer by putting instrument in zip lock bag and pressing gently watching the needle move. Tarnish around the bezel which will likely polish off, but does not detract. Case condition: Good for age. A bit of leather is missing on part of the rim. One of the two release pins is missing and will need to be replaced. Can open the side w/ missing pin using a stylus or awl. Both case and instrument bear initials: E. The item “Tycos Short & Mason double sided pocket barometer, thermometer, compass, cased” is in sale since Thursday, September 23, 2021. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “book_caser” and is located in Boston, Massachusetts. This item can be shipped worldwide.