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The daily newspapers of a few years hence will be vividly illustrated with photographic pictures of the personages and the events of the day. The gelatine photo-relief, already alluded to, will no doubt afford the basis of the principal processes by which this will be effected.
For special objects, also, photographs can be sent by telegraph through the use of the photo-relief in plaster of Paris, or other suitable material, which travels backwards and forwards underneath a pointer, the rising and falling of which is accurately represented by thick and thin lines or by the darker and lighter photographic printing of a beam of light of varying intensity at the other end, so that a shaded reproduction of the photograph is produced.
By producing a "photo-relief" in gelatine sensitised with bichromate of potash, and afterwards exposed first to the sun and then to the action of water an impression in plastic material can be secured, from which, with the use of warm, thin, pigmented gelatine, a hundred copies or more can be printed off in a few minutes.
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