thies gottingen thermo-hygrograph - Iron - thermo-hygrograph

thermo-hygrograph, specifically the well-known model Type 252 produced by the manufacturers Thies Göttingen in Germany. Function and operation: Combined measurement - the device measures and records simultaneously the ambient temperature and relative humidity. Mechanical registration: The interior contains a bimetal strip (for temperature) and a hair bundle (for humidity). The mechanical expansion of these moves two arms with ink pens. Clockwork drum: The pens continuously inscribe the data onto a paper chart strip (the diagram). This strip sits on a metal drum that slowly rotates via a mechanically wound clockwork (usually with a 7-day cycle). Application: This type of rugged, power-free measuring instrument has traditionally been used in laboratories, museums, archives, and meteorological weather stations to accurately monitor indoor or outdoor climate.