Thermohygrograph (C. F. Casella & Co. Ltd)

35 x 17 x 15 cm. Steel casing, Gluck daily clockwork mechanism, paper chart, bimetallic thermometer (steel/copper strip), human hair hygrometer. S/N 18497. Used before the emergence of digital data loggers for microclimate and ecology teaching and research; used by many cohorts of Geography students to assess thermal comfort in a variety of settings, including term-time accommodation. Current Y3 course on Climate Forensics demonstrates their use to contrast with the automated, digital loggers used today, and also the challenges of equipment standardisation and normalisation.