I like vintage antique scientific instruments. It is an early barograph; for measuring and recording barometric pressure and other meteorological work. This is an exceptional barograph in its original oak glass case. Mechanism signed by Negretti & Zambra of London. Also in the case is a Fahrenheit/centigrade thermometer in working condition. Footed case has a lower center drawer and all glass is original. Top of case is hinged on the left side for opening. I am not an expert on scientific instruments but I believe this piece is complete. Please review photos to make your own determination. Would make a great addition to your collection or an interesting display piece. Overall size is 19 long, 11 deep, and 12 high. If you have any questions, please do not hesitate to contact us. Either email any day of the week or call at our store 574-594-9100 on Friday, or Saturday. A word about condition. Those of you who have purchased from me before know that I am very picky about condition. I will try to note anything of significance in the description. However, please check the photos carefully---as they say `a picture is worth a thousand words' We will help arrange shipping for you; our experience with large or small has been excellent. We do offer an easy layaway program. Usually 20% down, with the remaining term somewhat negotiable. Please email us before you buy if you would like to discuss layaway terms. We have been in business over 30 years and our reputation is without flaw.