The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Polypose
Polypose. A term applied to combination or trick photo-graphs, in which a person is shown in several positions on the same plate. There are special and complex devices for making polypose photographs, notably that of M. Bracq ; but the follow-ing method will answer in most cases. Cut a circle of thin black cardboard to fit in the hood of the portrait lens, and double back a portion of the circle so as to leave between one-fourth and one-third of the lens exposed, the doubled edge being vertical. A position can now be found for this stop in the hood where it will shade about one-third of the field, as shown by the focussing screen, and an ideal adjustment for it would be a position in which two exposures - the hood being turned half round for the second - will give an evenly illuminated representation of a scene before the camera. Two such exposures are made to pro-duce a double, the sitter being in each case in that portion of
Fig. 107.
the scene which is brightly represented on the focussing screen. When a finer line of demarcation is required, the screen or stop may be inside the camera, at a distance from the plate to be found by experiment, the essential condition being that there shall be a vignetted overlapping of the background in each case, and that the background shall not be in any way shifted between the two exposures. If one of the subjects is to appear as a ghost - a person's own ghost appearing to him - the instructions given under Spirit Photography will serve as a sufficient guide for the ghostly part. Another kind of Polypose involves the prin-ciple of the kaleidoscope, and several, or many, aspects of the same person may be obtained at one pose and on the same plate - a matter of possible value to a sculptor requiring photographic assistance in his work. As regards this matter, an article in the Photogra?n gives the accompanying diagram, and says : - '* With two mirrors of large size, the number of effects obtainable is
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