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 367
oes a stick appear bent when plunged obliquely into the water ? Under what condition does change of density in the medium produceno change of direction ? What course will the incident and the refracted rays respectively takewith reference to a perpendicular to the refracting surface ? Distinguish… … 97. These effects may be illustratedby means of the marginal figure. Sup-pose O to be the point at which the lu-minous ray passes from one medium toanother, and that the two are separatedby the line B D, representing any sur-face either plane, concave, or convex;suppose the medium above BD to…
Physics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-85-61.webp)
