• Precision Aneroid Barometer Mk2 (x2)

Made by the company Negretti and Zambra in 1984 to measure atmospheric pressure. An aneroid barometer in which the movement of the face of the evacuated capsule is shown, not by means of a train of pivoted levers attached to a pointer, but by the deflection of one light, pivoted, counter-balanced electrical contact arm mounted in jewelled bearings. Electrical contact is established by manually rotating a micrometer screw. The reduction in backlash and friction greatly increases the accuracy of this instrument. This instrument is fixed into a wooden box with metal hinges and a plastic strap handle. Instructions on use and handling this instrument are attached to the inside of the box, certificate of calibration is also in the box in a plastic wallet. Both the box and the instrument have the reference and serial numbers attached. 2x examples

Ref No. MET. 20.005, Serial No. 2443/84.

Ref No. MET. 20.005, Serial No. 2386/77. Including Certificate of calibration 2013