On 28 Jan 2013 in rec.travel.europe, Jack Campin wrote:

Probably the same process as used in these early photos of Saint
Petersburg:

http://www.gridenko.com/pg
http://en.wikipedia.org/wiki/Sergey_Prokudin-Gorsky

Prokudin-Gorsky's pictures were technically better.

No, it's a completely different process. The Lumière process:

https://en.wikipedia.org/wiki/Autochrome_Lumi%C3%A8re

Prokudin-Gorsky used three separate plates, possibly exposed
consecutively. The article at the Library of Congress has a bit about
the camera(s) he used:

http://www.loc.gov/exhibits/empire/making.html

But although Prokudin-Gorsky knew about the Autochrome process, the
Wikipedia article about him says "No Autochromes by Prokudin-Gorsky are
known to survive."

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Joe Makowiec
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