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The periscope
PHD26A12_314

The periscope

Man observing the cathodic light spectrum
PHD26A04_288

Man observing the cathodic light spectrum

Astronome en observation
PHD26A13_142

Astronome en observation

Tidal bore on the Seine river in Paris, France
PHD26A14_056

Tidal bore on the Seine river in Paris, France

Fridtjof Nansen
PHD26A05_232

Fridtjof Nansen

Fridtjof Nansen
PHD26A05_233

Fridtjof Nansen

Observation by the telescope
PHD26A13_458

Observation by the telescope

Atget, Solar eclipse
PHD26A03_246

Atget, Solar eclipse