File contains a stereoscopic viewer and set of Kromogram stereoscopic images. A Kromogram was produced by a special camera and viewed through a Kromoscop.
The Kromskop is a stereoscopic viewer which combined the images from six black and white transparencies through colour filters to create a stereoscopic colour image. The six black and white transparencies were connected together in such a way that they could be 'draped' over the viewer. The set of six transparencies is called a Kromogrram.
To produce a Kromogram, the special camera took three pairs of images of a given object (an exposure time of a minute was required, which made it impractical for portrait work). It used a combination of mirrors, prisms and colour filters. The eventual positive was cut into three and mounted in a folded cardboard frame to form the Kromogram.
The three pairs of transparencies were black and white. However they differed in detail because they showed different features of the subject as transmitted through the particular colour filter.
The label on the box reads: "The Photochromoscope Syndicate, Limited, / 121, Shaftesbury Avenue, London W.C." The Syndicate, a British company, was established by Ives in 1898.
Kromogram consists of three black and white negatives made of one subject and there are four sets of three. One set focuses on botanical gardens/flowers, another on a vase of flowers, one on a Yorkshire farm and the last on two people sitting and reading.