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Pictures of ‘observation’ (exact matches)

French military balloon in the field, 1894
French military balloon in the field, 1894
In 1911, Lt. Giulip Gavotti became the first man to drop a bomb from a plane
In 1911, Lt. Giulip Gavotti became the first man to drop a bomb from a plane
Giovanni Schiaparelli, Italian astronomer
Giovanni Schiaparelli, Italian astronomer
X rays - I've nothing to worry about, he already has a little negro in his stomach
X rays - I've nothing to worry about, he already has a little negro in his stomach
Charles Darwin on the Galapagos Islands
Charles Darwin on the Galapagos Islands
Observation tower, Indochina
Observation tower, Indochina
Balloon
Balloon
Tethered military balloon at the Battle of Fleurus, 26 June 1794
Tethered military balloon at the Battle of Fleurus, 26 June 1794