Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 619
n. This effect -will be easily understood, by considering the middle verticalsection of one of the great annular lenses, already described, abstractly from its relation to the rest ofthe instrument. It will readily be perceived that this section possesses the property of simply refractingthe rays… … % i about a vertical axis, becomes the generating line of the enveloping hoop above noticed, such a hoopwill of course possess tin property of refracting an equally diffused zone of light round the horizon, Fig3302. The difficulty, however, of forming this apparatus appeared so great, that Fresnel…
Mechanical engineering
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