Very Nice Vintage Chelsea Brass Holosteric Barometer. This is the small Chelsea with a 4 dial. The piece appears to be in excellent condition however I do not know the mechanical condition. Please ask any questions you may have, thanks for looking! The item “Vintage Small Chelsea Brass Holosteric Barometer” is in sale since Sunday, October 18, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “greystone45″ and is located in Oxford, North Carolina. This item can be shipped worldwide.