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Humdity control chamber

Humdity control chamber

Heater for humidity control chamber

Heater for humidity control chamber

Vessel to contain up to 3 Dines balloon meteographs, met ref no 80115 (yellow), part of Dines meteograph calibration equipment

One of 2 calibration vessels mounted together

Dines meteograph calibration vessel, to be partly filled with petrol or other low freezing point liquid (1 of 2), Met Office ref no: 80115 (yellow), WP31.

One of 2 calibration vessels mounted together

2 calibration vessles mounted together. [Right hand side of picture]. Part of Meteorograph Calibration Apparatus.

2 calibration vessles mounted together

Dines meteograph calibration equipment (spirit thermometer to indicate temperature inside the bath below), Met Ref no: 80115 (yellow)

Spirit thermometer, mounted on calibration vessels

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

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

Mercury manometer, similar to WP35. [shown diagonally at left of main set of instruments]. Part of Meteorograph Calibration Apparatus.

Mercury manometer