THE 



PHILOSOPHICAL MAGAZINE, 



JULY 1799- 



I. On the Lovgitudinal Vihratmis of Strings and Rods, with 

 Ohfervattons on the Conveyance of Sound through folid 

 Bodies. By Dr. Chladni of IVittemherg *. 



jT HILOSOPHERS formerly were acquairited only with 

 the longitudinal vibrations of the air in a founding pipe^ 

 where, as is well known, the pipe or tube itfelf is not the fo- 

 norous body, but the column of air contained in it, which, 

 according to the dircclion of its length, contrails and expands 

 in various vi^ays. That folid bodies alfo can vibrate in the 

 direftion of their length, according to the fame laws, as the 

 above elaftic fluid in a pipe; and that the laws of this longi- 

 tudinal vibration are totally different from thofe of tranfverfal 

 vibration, I firft (hewed in regard to firings in my difcoveries 

 refpe6ling the Theory of Soiuidf? and in regard to rods 

 in my work on the Longitudinal Vibrations of Strings and 



** Extrafted from his work on that fubjedV, entitled,' Urher Longiivdi- 

 iialfchzumgungen der Saitcn und Sta.br- Netji he\gejuj_irn hcmerkwigen uber 

 die Fortleitung des Scballcs durcb frjie K'arpcr. 



I Entdcckimgcn iiber die Thcoiie dcs Klangcs, p, 76. Sec alfo Btr- 

 liner Mi'yikalif,.hen Mouaifcbrifl. Auguft 1791. 



Vol. IV. I Rods. 



