This barometer was made in england for the pinkham & smith in boston. The round part of the barometer is about 2 1/8 inches in diameter. Lengthwise, the barometer measures about 2 3/4 inches. The case measures about 2 1/4 inches in diameter. Pocket barometers were used by hikers and balloonists since they double as an altimeter as well as being a barometer. Starting at sea level 1/10th of an inch of barometric pressure is lost for every 90 feet ascended, so travelers can handily determine altitude. These barometers typically came with nice cases, such as the one pictured above.The item “Antique Cased Pocket Barometer” is in sale since Thursday, October 30, 2014. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “vintagesilverbullet” and is located in Boalsburg, Pennsylvania. This item can be shipped to United States.
