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With a view to making this little treatise more complete, Jackson has added two chapters, one on exact skiascopy and the other on auto-skiascopy. In the first chapter are discussed the procedures necessary to render skiascopy valuable, such as the dark room, the source of light, mirror, etc. In the second chapter the reader is instructed how to measure his own refraction by the use of an ordinary looking-glass, in addition to the apparatus commonly employed for the test.
Skiascopy and Its Practical Application to the Study of Refraction.. JAMA. 1906;XLVI(8):605. doi:10.1001/jama.1906.02510350055043