The stereograph produces this result in another way than by prisms as in the stereoscope. [Please select]
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The stereograph consists of a piece of card, having therein two circular openings about 1-1/4 in. [Please select]
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The principle on which the stereograph works may be demonstrated by a very simple experiment. [Please select]
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As a result of looking at it through the stereograph, one sees a colorless black and white picture which stands out from the background. [Please select]
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In the manufacture of a stereoscope the difficulty is in the proper arrangement of the prisms; with the stereograph, in the proper choice of colors. [Please select]
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