Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 99
perposed upon the living forces arising from theaction of the direct sound. The axis of the trumpet be-ing directed upon a person at a distance, sounds of audi-ble intensity may thus be conveyed to him, which hecould not hear from the unassisted organs of speech. § 83. The Hearing Trumpet,which is… … ELEMENTS OF ACOUSTICS. 91 opening and are so reflected as to become united at the Constructionsmaller end, which is inserted into the ear. and use; § 8i. Whispering Galleries, so called from the fact whisperingthat the faintest whisper uttered at one point may be dis-gallcrios;tinctly heard at…
Mechanics · Acoustics · Optics
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![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-123-43.webp)
