Six Lectures on Light

Delivered In The United States In 1872-1873

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Author: John Tyndall
Published: 1906
Language: English
Wordcount: 65,030 / 201 pg
Flesch-Kincaid Reading Ease: 66.3
LoC Category: Q
Downloads: 737
Added to site: 2005.02.19
mnybks.net#: 9663
Genre: Science
Excerpt

this star. Instead of being produced by ten cells, it is produced by fifty. Placed in a suitable camera, provided with a suitable lens, this powerful source will give us all the light necessary for our experiments.

And here, in passing, I am reminded of the common delusion that the works of Nature, the human eye included, are theoretically perfect. The eye has grown for ages towards perfection; but ages of perfecting may be still before it. Looking at the dazzling light from our large battery, I see a luminous globe, but entirely fail to see the shape of the coke-points whence the light issues. The cause may be thus made clear: On the screen before you is projected an image of the carbon points, the whole of the glass lens in front of the camera being employed to form the image. It is not sharp, but surrounded by a halo which nearly obliterates the carbons. This arises from an imperfection of the glass lens, called its _spherical aberration_, which is due to the fact that the circumferent

Reviews

Average Rating of 5 from 1 reviews: *****
2005.12.14
Dawn
*****

I read this book and it is amazing. There is an overview of so many discoveries by different scientist. Even in this age where everything is much more advanced it was great to go back and learn the basics on light. I truely recommend reading these lectures.


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