Great facts : a popular history and description of the most remarkable inventions during the present century (1860)
Bakewell, Frederick C. (Frederick Collier), 1800-1869 · New York, D. Appleton and company · leaf 105
que shade is placed before thelens of either of the lanterns, to prevent the lightfrom reaching the screen, the previous confusion be-comes instantly clear and distinct, and the church orthe landscape is seen without any interfering images.If the opaque screen be gradually withdrawn fromone lens,… … tive quantities of light permitted to issue from eachlantern to the screen. The two first of the accom-panying drawings are thus blended together in thethird, when the screen is half withdrawn from each. 90 GEEAT FACTS. It is usual to fix the opaque shade, which alter-nately covers and exposes the…
Inventions
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