Sunshine recorder. This mechanical device is used to measure how many hours of sunshine there are in a day. The glass globe acts as a lens,focusing sunlight onto a moving strip of recording paper. This produces a burn length that is proportional to the period of sunshine | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Brackenbury, Dr. John |
Taille de l’image : | 3425 px × 5157 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |