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 272
r points, all tending to A; so that awhisper or the scratch of a pin, which could not be conveyed di-rectly from B to A, would be heard plainly by accumulated reflec-tion from different points-in the circular surface B C A. 117. The most trifling sound may thus be heard from the oppo- What… … 270 ACOUSTICS. site side of the circular gallery at the base of the dome of St.Pauls cathedral, London, hence called the whispering gallery.There is also a whispering gallery in Gloucester cathedral, wherea narrow passage seventy-five feet in length extends across thewest end of the choir; and the…
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-68-46.webp)
