. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fk;. 14.—Koiiig-'H apparatus, a ?Maiiometric fai)snlo; M, rotating mirror. Ett'orts have also been made to analyze sounds by photographing a ray of light reflected from a vibrating mirror. Long ago, but with- out photography, Czermak applied this method to the phenomenon of the pulse, and in 18Tl> Blake'' devised a mirror for thus recording- speech. He used a small metallic plate, in the center of which was a small hook which is attached
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fk;. 14.—Koiiig-'H apparatus, a ?Maiiometric fai)snlo; M, rotating mirror. Ett'orts have also been made to analyze sounds by photographing a ray of light reflected from a vibrating mirror. Long ago, but with- out photography, Czermak applied this method to the phenomenon of the pulse, and in 18Tl> Blake'' devised a mirror for thus recording- speech. He used a small metallic plate, in the center of which was a small hook which is attached to a very light mirror delicatel}' swung on .two pivots, (\ (', fig. 18. A ray of light is thrown on the mii-ror by a convex lens; after reflection it again traverses a lens and falls on :i photographic plate in movement. Sharp, well-detined images are thus obtained (flg. 19). «Stein: Die Licht iin dien^te wissenschaftlicher Forschung (Leipzig, 1877). ''Doumer: C. R. de rAcadeinie des Sciences, 1S86. 'Marage: Etude des Cornet Acoiistiques i)ar la Pliotograpliie des Flanuiics .Mano- metri(jues de Knnig (1897). ''Blake: American Journal of Science and .\it, 1S7S; .Tonrnal di- , 1S7!).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
Size: 1134px × 2203px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
