2 calibration vessles mounted together. [Right hand side of picture]. Part of Meteorograph Calibration Apparatus. 2 calibration vessles mounted together
Calibration vessel, early design. [lowest left in picture]. Part of Meteorograph Calibration Apparatus. Calibration vessel
Mercury manometer, fitted with platinum contacts to operate at definite absolute pressures [diagonal piece on left hand side of photograph]. Part of Meteorograph Calibration Apparatus. Mercury manometer 1941
Dines meteograph calibration equipment, calibration vessel for up to 3 meteographs, 2082, met ref no 80115 (yellow) [at left of centre of upright pieces, set vertically]. Part of Meteorograph Calibration Apparatus. Dines meteograph calibration calibration vessel
Absolute mercury manometer. Used for measuring absolute pressures between one atmosphere & zero under any contitions of surface pressure & temperature. No.11. Made at Kew Observatory 1941. Part of Meteorograph Calibration Apparatus. Absolute mercury manometer
Mercury manometer, similar to WP35. [shown diagonally at left of main set of instruments]. Part of Meteorograph Calibration Apparatus. Mercury manometer
