AVQ-A-001391-0198 Half-length portrait of the French astronomer Pierre Janssen Credit: Alinari Archives, Florence WARNING: Permission must be required for non editorial use. Please contact Alinari Archives Photographer: Nadar, Paul Date of photography: 1885-1895 ca. Collection: Alinari Archives-album collection, Florence Object type: print on paper Photographic technique: P gelatin silver print Dimensioni: 7,5 x 4,3 cm Technical info Image sizes (pixel): 1896 X 2771 Image sizes (cm at 300 dpi): 16 X 23 Image sizes (MB): 3.65 Color space: RGB