. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. 1 For details of these experi-ments and their practical manage-ments cf. Taylors Memoir, xxi.; Phil. Mag., xiv. 1, , xxii. 286. In America, detailsmay be found in SmithsonianBeports, 1865, p. 207. Three lec-tures by Mr. C. V. Boys on Soaj)Bubbles ( 2s. 6d.) arepublished just as these pages goto press, and describe other attrac-tive projection experiments inthis branch of physics. Fig. 116.—Plateaus Experiment Q2 228 OPTICAL PROJECTION

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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906