Six Lectures on Light
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Six Lectures on Light is by John Tyndall, and the lectures were delivered in the United States in 1872-3. The preface says the author has sought to render clear a difficult but profoundly interesting subject, describing and illustrating in a familiar manner the principal laws and phenomena of light. Experiments use a light produced by fifty cells instead of ten, an enlarged form of the small star of light seen between two rods of coke.
A film of gypsum is described shining with colours, because red requires a greater thickness than blue to produce the retardation necessary for extinction. The text says it is demonstrable by experiment that from the red, green, and violet all the other colours of the spectrum may be obtained. A work by Christian Ernst Wünsch, Leipzig 1792, is named as announcing that there are neither five nor seven, but only three simple colours in white light.
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Book facts
- Author
- John Tyndall
- Pages
- 118
- Language
- English
- Genre
- Popular Science
- Formats
- PDF, EPUB, Read online