Observes posters & prints

Observations on certain curious Indentations in the Old Red Sandstone of Worcestershire and Herefordshire, considered as the tracks of antediluvian... Anonymous

The old observing-room, Greenwich Anonymous

Taking Observations with a Sextant Andrew Pitcairn-Knowles

Observing with the dipleidoscope Unknown

Observing a solar eclipse, 1673 Unknown

Observations Upon Stilts English School

An Indian spy observes the arrival of a Spanish ship on the Mexican coast, 1579 Diego Duran

Observation officer and signallers keep a sharp lookout, St Quentin, France, World War I Realistic Travels Publishers

Observing a total solar eclipse, 1851 (1857) Anonymous

Paris Observatory, France, 1740 Unknown

Henry VIII and Anne Boleyn Observed by Queen Catherine, 1870 Marcus Stone

Observer's Mate WA & AC Churchman

Observations on the Neilgherries, Neelgiries map Anonymous

I.K. Brunel and Others Observing the Great Eastern Launch Attempt Robert Howlett

Observations on the Neilgherries, map of the route from Madras to Ootagamund Anonymous

First Navy Observation Balloon Anonymous

Artillery observation officer in forward post, France, World War I Realistic Travels Publishers

Commander Evans observing an Occulation of Jupiter Herbert Ponting

Series of observations of the planet Saturn, 1656 Unknown

Horse sticking head out stable window Anonymous

King of Siam (Thailand) observes the lunar eclipse from his palace Aart Dircksz Oossaan

Lovers observed George Morland

Observers, 2011 Vincent Alexander Booth

'Observation post of General Mangin, 18th July 1918', Villers-Cotterets, Aisne, France Francois Flameng

Observer listening post Associated Newspapers

Plate XXXVIII from Campi Phlegraei: Observations of the Volcanoes of the two Sicilies Pietro Fabris

Observer of a kite-balloon testing the telephone before ascending Anonymous

Observation Car of the Coronation Anonymous

Temporary observatory for pendulum observations, Sumatra unknown

The Forthcoming Transit of Venus: Shed at Honolulu from which the Model of Venus is Observed, and One of the... Anonymous

Head-and-Shoulders Portrait of Jean Marie Joseph Coutelle, Commander of the First Military Balloon Observation Unit in 1794 Anonymous

William Dampier, English buccaneer, sea captain, author and scientific observer McFarlane and Erskine

View of Hamilton escorting their Sicilian majesties on 11th May 1771, to observe the lava flow from the great eruption... Pietro Fabris

The Return of the Balloon Francois Flameng

Men Observing Early Surgery Anonymous

Michael and Mrs. Faraday Observing Experiment Anonymous