Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 204
433. A SpEAKreo-TRUMPET (Fig. 191) is ispeaking-Trum. liollow tubc SO coustructed that the rays of^ sound (proceeding from the mouth when ap- plied to it), instead of diverging, and being scatteredthrough the surrounding atmosphere, are reflected from thesides, and conducted forward in straight…
Physics · Science · Technology
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