Dr. R. Konig on Manomstric Flames. 5 



with two organ-pipes which together give the interval of the 

 octave, the series corresponding to the higher tone gives double 



Fig. 2. 



the number of flames that the other one does, by which the vi- 

 brations are shown to be in the ratio of 1 : 2 (PI. I. fig. 3) . 

 If we take organ -pipes of other intervals, we get with the fifth 

 three flames above two, with the fourth four above three, and so on. 

 The rapidity of the motion of the flames allows their reflections 

 in the mirror to be very sharply defined; but as they are of 

 very short duration, it would be difficult in this experiment to 

 observe trifling deviations from the purity of the intervals ; for 

 although in point of fact it is easy to recognize that in one of 

 the series there are almost always two flames when there is one 

 in the other, yet it would be difficult to discover that about 200 

 in the one series coincide with about 101 in the other. These 

 exact observations can be made with the greatest facility, how- 





