Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 619
on. 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…
Mechanical engineering · Mechanics · Engineering
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