This is an Estate Sale find. It is an Antique Brass Forest Service Compensated Short & Mason ltd London Barometer. It is in great shape. The crystal has a small chip on the right side. The item “Surveying Short & Mason London Forest Service Compensated Barometer” is in sale since Wednesday, May 20, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “belvedere66″ and is located in Dufur, Oregon. This item can be shipped to United States.