Barograph by Bonvalot Lille, C1910
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A French aneroide barograph by Bonvalot Opticien Lille of gilt brass and thick beveled glass, of unusually small size. The small drum contains a 8 day clock and has a seven day chart fixed to it. The stack of bellows activate the arm with the ink knob attached, and the barometric pressure is recorded on the paper chart as a continuous line. Fully overhauled and fully working. There is a lable of Bonvalot – lille on the Barograph and a Serie number 57185 with an Anchor with the letters L & N is engraved in the Barograph. Measurements 19,5 x 13 x 13,5 cm
