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Negretti and Zambra thermohygrograph

1930-1950

First pattern of Deutsche Seewarte standard thermohygrograph

1950

Thermohygrograph in brass case made by A. Gallenkamp and Co. Ltd., London, c. 1900-1950, used to record humidity and temperature in the laboratory at the Horlicks Factory in Slough.

Thermohygrograph in brass case made by A. Gallenkamp and Co. Ltd.

1900-1950

Thermohygrograph by F. Darton and Co. Ltd., Watford, England, 1957

Thermohygrograph by F. Darton and Co. Ltd.

1957

Thermohygrograph, 1986. (Bimetallic Thermometer, Hair Hygrometer) in plastic case, 30 x 20 x 20cm. (Casella Product No. T 9184/C/MK 2) by Casella (London) Ltd, London, England, 1986.

Thermohygrograph, 1986

1986

Thermohygrograph made by Cole-Palmer, c. 1940-1970, used to record humidity and temperature in the laboratory at the Horlicks Factory in Slough.

Thermohygrograph used in the Horlicks factory laboratory

1940-1970