‘observation’ historical pictures (exact matches)

Il Presidente della Repubblica Francese alla fronte italiana
Il Presidente della Repubblica Francese alla fronte italiana
Discovering Our Cities: The Marvel of the Mersey (Liverpool). Jeremiah Horrocks.
Discovering Our Cities: The Marvel of the Mersey (Liverpool). Jeremiah Horrocks.
Claudius Ptolemy, Greco-Roman astronomer and mathematician and geographer
Claudius Ptolemy, Greco-Roman astronomer and mathematician and geographer
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
Percival Lowell
Percival Lowell
Observation balloon ascending, World War I
Observation balloon ascending, World War I
Man's observation on a woman he admires
Man's observation on a woman he admires
Astronomy explained upon Sir Isaac Newton's principles
Astronomy explained upon Sir Isaac Newton's principles