This beautiful antique stick barometer was manufactured by negretti and zambra between 1850 and 1859. It was distributed at their first address of 1 hatton garden & 59 cornhill, london. This marking is clearly identified in the upper gage of the instrument. In addition, the number 107 and holborn hill are depicted on the upper left corner of the barometer. Each of the scales are finely engraved and the case is made of mahogany. The original cistern and float system are firmly in place. The very large bore glass tube is also believed to be the original component of the barometer and holds a large volume of mercury (looks full). The calibration set knob is believed to be replaced. The overall condition and quality of the barometer is high to excellent. The length of the barometer is 37 inches.The item “19th Century Scientific Stick Barometer Negretti & Zambra (c1850)” is in sale since Monday, March 16, 2015. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “jas6421″ and is located in Fort Worth, Texas. This item can be shipped worldwide.