File:Philosophical Transactions - Volume 006 - p3086.png

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English: In the annexed design of this Experiment, A B C expresseth the Prism set endwise to sight, close by the hole F of the window E G. Its vertical Angle A C B may conveniently be about 60 degrees: M N designeth the Lens. Its breadth 212 or 3 inches. S F one of the streight lines, in which difform Rays may be conceived to flow successively from the Sun. F P, and F R two of those Rays unequally refracted, which the Lens makes to converge towards Q, and after decussation to diverge again.
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Source https://en.wikisource.org/wiki/Page:Philosophical_Transactions_-_Volume_006.djvu/312
Author The Royal Society of London

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Philosophical_Transactions_-_Volume_006_-_p3086.png

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