Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
)lano-convex lenses, thecombined efiect of which isto cause the image to appearunder the much enlargedvisual angle indicated by thetwo dotted lines H and N. 494. Lord Rossesreflecting telescope has a tube 56 feet long by 7 feetdiameter, Avith a speculum of6 feet diameter, weighing 4 tons; and the… … OPTICS. 277 ^95. Figure 27.—The telestereoscope.—Owing to tlie factthat the two eyes do not view an object from the same point (447), theimage formed on the two retinae are not exactly alike (469), and by thedifference in the images we are aided in judging of the distance andfigure of the object…
Physics · Astronomy
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