Many of the techniques used by both Maxwell and Gorskii are no longer available to us. According to the archives at the Library of Congress, Washington D.C (where Gorskii’s work is held), there is no known replica or illustration of the camera that Gorskii used. It is thought that it was similar to a model designed around 1906 by Dr. Adolf Miethe. The images below are from the Library of Congress web resource: ‘The Prokudin-Gorskii Photographic Record Recreated: The Empire That Was Russia. See more here. With the generous assistance from Calvert 22 Gallery in London and the curator of Close and Far: Russian Photography Now, Kate Bush, I have been pointed to a source that states that Gorskii had visited Miethe and studied under him for six weeks in 1902. Bush notes that at that time, Miethe was the most advanced practitioner of 3-colour photography.