An elementary treatise on optics / by I.W. Jackson.

  • Jackson, I. W. (Isaac Wilber), 1804-1877
Date:
1867
Catalogue details

Licence: Public Domain Mark

Credit: An elementary treatise on optics / by I.W. Jackson. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    OPTICS. INTRODUCTION. I. Two theories have been proposed to account for the phenomena of light : the theory of emission, and the wave-theory. In the former, the pheno- mena are conceived to be due to the emission of exceedingly minute particles of matter from the luminous body; in the latter, it is assumed that all space is pervaded by a medium of extreme tenuity; that luminous bodies possess the quality of exciting vibrations in this medium, and that these vibrations constitute light. In the following work, the more common pheno- mena of light will first be considered without refe- rence to either theory, though the language of the former may occasionally be used for the sake of convenience. 2. Bodies which possess the property of exciting the sensation of light, are said to be luminous. [Optics.] 1
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