The Book of the Lantern: Being a Practical Guide to the Working of the Optical (or Magic) Lantern. With Full and Precise Directions for Making and Colouring Lantern Pictures (With Seventy Illustrations)

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Edward L. Wilson, 1889 - Lantern projection - 278 pages
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Page 71 - ... times the intensity of the brightest part of the flame of an Argand burner of the best construction, and supplied with the finest oil.
Page 227 - ... whatever upon the ice. But the liquefaction is not uniformly diffused. From separate spots of the ice little shining points are seen to sparkle forth. Every one of those points is surrounded by a beautiful liquid flower with six petals. " Ice and water are so optically alike that unless the light fall properly upon these flowers, you cannot see them.
Page 108 - ... about the middle; then reverse it again, and move it in several directions to get the balsam level. This may be done with a very little practice so that the surface shall be undistinguishable from glass. We have now a perfect transparency. All that is required is twenty-four hours for hardening (keeping the glass level), and then another square of glass fastened on to it by strips of paper at the edges, with small pieces of card at the corners to prevent contact, and it makes an admirable lantern...

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