Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 619
33:)3 … every point of the horizon. 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…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
