1840s

10

Calotype

Patented in 1841, influential in the 1840s

11

Cyanotype

Invented in 1842, Atkins' picture books from 1843 onwards.

12

Salted Paper Print

From 1840 onwards; widespread before albumen paper

13

Anthotype

1842, Sir John Herschel's experiments with plant juices

14

Petzval Swirl Bokeh

1840, Josef Petzval's portrait objective

15

Dissolving Views

1830s-1840s, Henry Langdon Childe's magic lantern shows

16

Harmonograph

1840s; invention often attributed to Hugh Blackburn in 1844

17

Astrophotography

1840, John W. Draper's daguerreotype of the Moon

18

Photomicrography

1840s, early work by Alfred Donné and William Henry Fox Talbot