Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 164
SOUND. 141 RE-ENFORCEMENT UF SOUND. The re-enforcement of sounds by the vibration of con-fined masses of air may be readily investigated withoutapparatus, that is, such apparatus as is commonly employedin acoustical experiments. A very simple experiment illus-trating the fact that a sound may be… … ^S/Jilhl Re-enforcement of Vocal Sounds. requisite for tnis experiment is a paper tube 16 or 18 incheslong and about 3 inches in diameter, or, in the absence ofsuch a tube, a sheet of thick paper rolled into a tube willanswer. This tube should be held with one end near themouth, the opposite end…
Physics · Lantern projection · Electric apparatus and appliances
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher05nati-320-204.webp)
![An illustration from [Catalogue] (1908)](https://img.insideoutlibrary.com/img/200/ia-catalogue00demo-81-166.webp)
