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by Omikron
$15.00
Size
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Product Details
Our spiral notebooks are 6" x 8" in size and include 120 pages which are lined on both sides. The artwork is printed on the front cover which is made of thick paper stock, and the back cover is medium gray in color. The inside of the back cover includes a pocket for storing extra paper and pens.
Design Details
Fraunhofer demonstrating his 1814 invention, the spectroscope, a device used to examine properties of light. Photogravure from a painting by Richard... more
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Fraunhofer demonstrating his 1814 invention, the spectroscope, a device used to examine properties of light. Photogravure from a painting by Richard Wimmer. Joseph von Fraunhofer (March 6, 1787 - June 7, 1826) was a German optician. One of the most difficult operations of practical optics was to polish the spherical surfaces of large object glasses accurately. Fraunhofer invented a machine that rendered the surface more accurate than it was left by the grinding. He invented other grinding and polishing machines, and introduced many improvements into the manufacture of the different kinds of glass used for optical instruments. In 1814, Fraunhofer invented the spectroscope. He discovered that bright fixed line which appears in the orange color of the spectrum when it is produced by the light of fire. This line enabled him to determine the absolute power of refraction in different substances. Experiments to ascertain whether the solar spectrum contained the same bright line in the orange...
$15.00
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