Joseph-Michel Montgolfier, French balloonist, late 18th century.

Samuel Cousins, British printmaker, 1883.

A Philosopher gives a Lecture on the Orrery

Portrait of a woman, 19th century.

Nicolaas Henneman taking a calotype portrait of Pullen, c 1841.

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).

Salted paper print from a calotype negative by William Henry Fox Talbot (1800-1877).