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Box of Glass Slides - Kromskop Viewer Set, Kromograms, circa 1895 Object Reg. No: ST 023773 6

Original box containing five Kromograms.

A Kromogram was produced by a special camera. A Kromogram was then viewed through a Kromoscop.

The Kromskop is a stereoscopic viewer which combined the images from six black and white transparencies through colour filters to creat 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, respectively red, blue and green on a single plate that measured 2½ x 8 inches.

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 colout filter.

The Kromskop itself, by an arrangement of mirrors, coloured glass screens, red, green and blue filters, and a light source, produced a full colour and stereoscopic image.

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. Each of these negatives is taken through a separate screen, one red, one green and one blue violet. A positive transparency is made from each negative. The positives are each viewed through a screen of the same colour as that through which each was taken. The three positives are viewed through a kromskop which unites the three into a natural colour picture.
Discipline: Technology
Dimensions: 61 mm (Height), 73 mm (Width)
Dimension Comment: Box with lid closed.

More information

Tagged with: stereographs, stereoscopes
Themes this item is part of: Images & Image Making Collection
Primary Classification: PHOTOGRAPHY
Secondary Classification: Image Viewing Equipment
Tertiary Classification: stereo viewers
Inscriptions: Label on Box: "The Photochromoscope Syndicate, Limited, / 121, Shaftesbury Avenue, London W.C."
Manufacturer: The Photochromoscope Syndicate Ltd, London, England, Great Britain, circa 1895
Inventor: Mr Frederic Ives, Philadelphia, Pennsylvania, United States of America, pre 1895

Frederic Ives was a United States citizen, who invented the Kromoscop. He set up a British company in London.
References: http://bioscopic.wordpress.com/2008/01/12/colourful-stories-no-2-the-kromskop/
accessed on 24 September 2008

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