‘Observation’ historical pictures (exact matches)

Claudius Ptolemy, Greco-Roman astronomer and mathematician and geographer
Claudius Ptolemy, Greco-Roman astronomer and mathematician and geographer
Discovering Our Cities: The Marvel of the Mersey (Liverpool). Jeremiah Horrocks.
Discovering Our Cities: The Marvel of the Mersey (Liverpool). Jeremiah Horrocks.
Percival Lowell
Percival Lowell
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
Observation balloon ascending, World War I
Observation balloon ascending, World War I
Il Presidente della Repubblica Francese alla fronte italiana
Il Presidente della Repubblica Francese alla fronte italiana
Measurement: a scholar making observations of a pendulum, with two servants, one writing at a table
Measurement: a scholar making observations of a pendulum, with two servants, one writing at a table
Giovanni Schiaparelli, Italian astronomer
Giovanni Schiaparelli, Italian astronomer