Hermann von Helmholtz
Treatise on Physiological Optics
Comments
The text overlay to the scanned images is based on automated optical character recognition. Thus, (1) if you quote the OCR text you should first check it against the images, and (2) searching for a particular term may not reveal all instances of that term. Beware that hyphenated words appear as separate word parts. The Physiological Optics also contains a traditional subject index (pp. 706-723).
The DjVu version of the document contains hyperlinks from the Table of Contents to the various chapters. Djvu does have a searchable OCR that does not allow cutting and pasting of text.
Readers may be interested to know that the Physiological Optics has recently been reprinted by Thoemmes Press, with a special Introduction by Nicholas Wade.
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Acknowledgments
The Optical Society of America translated this work and published it in 1924-5. Gryphon Editions, Ltd., printed the 1985 edition from which this work was scanned. Thanks also to Laura Lee and John Childs at OSA, and to John Grafton at Dover Publications, for their help in clarifying copyright status. Thanks to Penn's School of Arts and Sciences for funds that supported this project, to Lauris Olson at the Penn Library for helpful advice at several stages, and to Prof. Brian Wandell of Stanford University for wishing aloud that Helmholtz be put online.
Where to find classics in Psychology
The site http://psychclassics.yorku.ca has an excellent collection of classics in Psychology, and web links to many other classics.
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