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| Keywords: Kundt tube.png Drawing of the acoustic apparatus called Kundt's tube invented by August Kundt in 1866 to measure the speed of sound in gasses; also shows standing wave patterns created with it From Kundt's original 1866 paper The device fig 6 7 was a horizontal glass tube B B' containing a small amount of fine powder One end had a piston attached to the end of a metal resonator rod A A' clamped at its center K excited by rubbing with chamois so it radiated sound waves into the tube The other end was blocked by a moveable piston I which could be used to adjust the length of the tube When the tube was adjusted to resonance the powder collected in piles at the nodes of the standing wave as shown in Fig 3 at intervals of half a wavelength λ/2 allowing the wavelength of the sound to be measured Figs 1 2 4 show more complicated patterns striations produced by the sound waves Alterations to image Rotated 90° clockwise Downloaded 2009-06-25 from http //books google com/books id NXMEAAAAYAAJ pg RA1-PA497 Kundt A 1866 Ueber eine neue Art Akustischer Staubfiguren und über die Anwendung derselben zur Bestimmung der Shallgeschwindigkeit in festen Körpern und Gasen Annalen der Physik Vol 127 Issue 4 p 497-523 J C Poggendorff Leipzig image from Plate 5 p 671 on Google Books 1866 August Adolf Eduard Eberhard Kundt Public Domain - Kundt died in 1894 PD-old Kundt's tube Annalen der Physik Music diagrams | ||||
