A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 417
optics. cations of dioptrical telescopes, we must refer the reader to theworks mentioned at the end of this treatise. II. REFLECTING TELESCOPES. 253. Newton, as elsewhere stated, despairing- of the discoveryof a method of forming achromatic lenses, directed his attentionto the improvement of the… … 254. The preceding diagram shows the general constructionand effect of the Newtonian reflecting telescope, in which theconcave metallic speculum C D receives the rays issuing from theobject A B, which it renders convergent, and thus forms a revers-ed image in the plane mirror E F, inclined at an…
Physics
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