John Trotter walnut-cased Barograph, having five beveled glazed removable lid, and a drawer below to house the charts. The mechanical eight-day movement is housed in the drum, fitted with a seven-day chart that covers one full rotation of the drum. The ink trace, or barogram, on the recording paper, is a visual record of changes in pressure.The aneroid barometer mechanism has seven stacked vacuum capsules and utilizes a gate suspension, a refinement developed to improve sensitivity. The barograph has a thermometer and its original glass ink bottle recessed into the case.DimensionsHeight 9 InchesWidth 14.5 InchesDepth 9 InchesDelivery Information At Shackladys Antiques, we want your experience to be as enjoyable and as easy as possible. We want to give you all the information you need throughout the order process, and because we care about our customers and the service they expect, you can rely on us to keep you informed every step of the way.Paying for y...