Optical projection: a treatise on the use of the lantern in exhibition and scientific demonstration (1906)

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450 OPTICAL PROJECTION WER 291; combustion-lantern, 308; simple electroscope, 398 Wernicke's direct prism, 293 Wheatstone's kaleidophone, 252, 266 White light, composition of, 285 Wire rings for soap-films, 326 Wood's lime-jet, 65 Woodward, Col., and concave amplifiers, 187 ZIR Work, an exhibitor's, 113 YELLOW, compounded, 303 ZEISS'S eye-pieces, 188 ; lenses, 194 objective-changers, 189 Zirconia for O.-H. light, 68