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Excerpt from Rational Recreations, Vol. 2: In Which the Principles of Numbers and Natural Philosophy Are Clearly and Copiously Elucidated, by a Series of Easy, Entertaining, Interesting Experiments, Among Which Are All Those Commonly Performed With the Cards
Fig. 1. Shows the manner in which the rays of light converge and diverge. Fig. 2. Different objects feen under the fame optic angle. Fig. 3. The refraction of a ray of light, ab, in pa¿ing through different mediums. Fig. 4. The different forts of lenfes.
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