The Color Photography of Prokudin-Gorskii.

Sergei Mikhailovich Prokudin-Gorskii (1863-1944) produced thousands of glass-plate negatives. These were mainly used to illustrate his lectures about the Russian Empire, which he had surveyed as photographer to the Tsar.

Prokudin-Gorskii projected the slides through the red, green, and blue filters of a device known as a "magic lantern" which superimposed the images onto a screen resulting in a full-color picture. –The Empire That Was Russia

The US Library of Congress has produced prints for an exhibition of Prokudin-Gorskii’s work using a process called digichromatography, which allows the pictures to be viewed as Prokudin-Gorskii intended.