Thermohydrograph in protective case
Numéro d’image : 11826726
| A thermohydrograph in its protective case. This is an instrument for making local temperature and relative humidity measurements of the air. It consists of a metal-ring thermometer (top) and a hygrometer. Both instruments leave traces on a slowly-rotating recording barrel at left; the barrel is fitted with a chart that can record a whole week of data. The slots in the case at right allow natural air circulation to prevent artificial 'greenhouse' warming inside the transparent box,but also act as a baffle against stronger air movements. The readings shown here are approximately 19 Celsius and 45% relative humidity | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Stevenson, James |
| Taille de l’image : | 2530 px × 3543 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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