This is a 19th century (1800s), english wheel (or banjo) barometer convex glass crystal. The crystal is permanently set with some kind of early cement or plaster in a brass bezel. Includes both mounting screws. The bezel has a diameter of 8 7/8. The glass is free of any cracks, chips or fogging. If the item description appears to be cut-off or lacking words from the right side, please cut and paste the paragraph into notepad, wordpad, or the like, to see the complete description. Please contact me for details. Thank you for taking the time to look. Please look at my. The free listing tool.The item “19TH CENTURY (1800s) ENGLISH WHEEL BAROMETER CONVEX GLASS CRYSTAL & BEZEL 8 7/8″ is in sale since Thursday, March 05, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “timeforgot1″ and is located in Bremen, Maine. This item can be shipped worldwide.