THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[FOURTH SERIES.] 



JANUARY 1873. 



1. On Manometric Flames. By Dr. Rudolph Konig [of Paris)*. 

 [With Two Plates.] 



IN the beginning of 1862 I invented a new method of ob- 

 servation, which had for its object to make apparent the 

 sounding air-waves, or, what is the same thing, the changing 

 density of the atmosphere while penetrated by sounding vibra- 

 tions, or while itself in a state of vibration, in the same way as 

 acoustic experiments were able to show clearly the vibration of 

 bodies which produce the vibration of the atmosphere. 



The first apparatus founded on this method was shown in the 

 London Exhibition of 1862; and since that period I have 

 invented a whole series of apparatus on the same principles : a 

 short description of some has appeared in PoggendorfPs Annalen 

 for 1864 ; and others are briefly sketched in my Catalogue of 

 1865. 



The following pages are designed to explain all these appa- 

 ratus, as well those which have been added since the publica- 

 tion of my Catalogue, as also the experiments in connexion with 

 them. 



The small instrument, on the use of which my method is 

 founded, and to which I have given the name of Manometric 

 Capsule } consists of a cavity in a wooden plate, whose orifice is 

 closed by a thin membrane. Illuminating gas may be intro- 

 duced into this cavity through a pipe — a second pipe, termina- 

 ting in a gas-burner, giving means for exit and ignition. 



Now, if the air before the membrane be rendered suddenly of 



* Translation, communicated by the Author, from Poggendorff's 

 Annalen, vol. cxlvi. p. 161. 



Phil. Mag. S. 4. Vol. 45. No. 297. Jan. 1873. B 



