Unusual mahogany-cased barograph and barometer by Negretti & Zambra, having five glazed removable lid. 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 eleven stacked vacuum capsules and utilizes a gate suspension, with an unusual half-round barometer dial. The barograph having a glass ink bottle recessed into the case.
Dimensions
Height 7.5 Inches
Width 14.5 Inches
Depth 7 Inches
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