Period

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A small refractor mounted on a wheeled frame
ARP23A16_193

A small refractor mounted on a wheeled frame

American military observers use an abandoned German position at Montsec
ARP18A13_444

American military observers use an abandoned Germa...

German observer takes a lookout position on the eastern Front at the Dnieper River 1941
ARP18A04_406

German observer takes a lookout position on the ea...

Plates from the Second Book of the De Humani Corporis Fabrica by Vesalius
ARP18A05_329

Plates from the Second Book of the De Humani Corpo...

American military observers
ARP17A40_075

American military observers

Robert Hooke's proposal for an aerial telegraph
ARP17A31_123

Robert Hooke's proposal for an aerial telegraph

The death of Ananias by Ugo de Carpi
ARP17A30_257

The death of Ananias by Ugo de Carpi

Village of Attu
ARP17A23_228

Village of Attu

British observers during the Boer War in South Africa 1901
ARP17A13_488

British observers during the Boer War in South Afr...

World War I : French observation post
ARP10A02_094

World War I : French observation post

World War I : French observation platform
ARP10A02_114

World War I : French observation platform

Ventilating a mine
ARP07111_009593P

Ventilating a mine

A rag-and-chain pump used to drain a mine
ARP07111_009614P

A rag-and-chain pump used to drain a mine

Ventilating a mine
ARP07111_009615P

Ventilating a mine

Assaying copper
ARP07111_009636P

Assaying copper

Assaying of silver : man making the cupels
ARP07111_009637P

Assaying of silver : man making the cupels

Stove and pots used for mercury extraction
ARP07111_009674P

Stove and pots used for mercury extraction

Spectre of the Brocken or the Brocken Bow
ARP07112_010079C

Spectre of the Brocken or the Brocken Bow

Observers using a refracting telescope
ARP07113_010554P

Observers using a refracting telescope

The 'equatorial coude' refracting telescope
ARP07113_010562P

The 'equatorial coude' refracting telescope

Francis Trevelyan Buckland
ARP07115_011232P

Francis Trevelyan Buckland

In 1822 the French appointed commission to finding the speed of sound in air
ARP07103_460000573

In 1822 the French appointed commission to finding...

In 1822 the French appointed commission to finding the speed of sound in air
ARP07103_460000574

In 1822 the French appointed commission to finding...

Great Pyramid of Cheops at Giza as astronomical observatory
ARP07095_390001234

Great Pyramid of Cheops at Giza as astronomical ob...

Great Pyramid of Cheops at Giza
ARP07095_390001289

Great Pyramid of Cheops at Giza

Ptolemy
ARP07095_390001301

Ptolemy

Johannes Bayer, constellation of Andromeda
ARP07096_390001528

Johannes Bayer, constellation of Andromeda

Biringuccio, Charcoal burning
ARP07096_390001530

Biringuccio, Charcoal burning

William Herschel, Telescope
ARP07096_390001535

William Herschel, Telescope

IR&G Cruickshank, Illustration for Pierce Egan "Life in London"
ARP07096_390001545

IR&G Cruickshank, Illustration for Pierce Egan "Li...

Crop Rotation
ARP07096_390001632

Crop Rotation

Amerigo Vespucci
ARP07096_390002045

Amerigo Vespucci