Philosophical instructor, or, Webster's elements of natural philosophy : subdivided into principles and illustrations ; intended for academies, medical schools, and the popular class-room (1824)
Eaton, Amos, 1776-1842, Webster, John, fl. 1804-1824 · Albany : Printed by Websters and Skinners ... · leaf 168
nd the other sphe-rical, which formsthe segment of a sphere. 2. Is double convex, hav-ing both sides the same, and is like two equal seg-ments of a sphere joined together. 3. Is a plano-concave lens ; one of its sides being flat, and the otherhollow, such as would be represented by the impres-sion… … 166 LENSES. called a meniscus, havingother concave, like the 5th ; one side convex and the but the convexity ex- the two sides meet so as to converging the axis orof ceeding the concavity,form an edge. The line b d, which passes through the middle ofthe lens perpendicular to the sides, is called…
Physics
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