28 MR SWAN ON THE CONSTITUTION OF FLAME. 
Second Set of Observations. 

ae 130 vr 


Means 126:67 

Mean observed breadth of spectrum = 127-06. 
In the following tables the above numbers have been corrected by subtracting 
the index error of the micrometer=6°52. 
Comparison of Observations. 


First Set of Observations. Second Set of Observations. 

Difference from Difference from 




Mean Breadth. 128:20 Mean Breadth. Mean Breadth. 
Breadth at B, , 128°15 — 0-39 
: b, ‘ 130°31 + 1:27 

126:15 — 0°89 


The Observed Dimensions of the Flames reduced to inches.* 


First Set of Observations. Second Set of Observations. 




Difference from 
-19268 Difference from 
Mean. 
Mean Breadth. -20493 M. 
ean. 







—°00009 19206 —-00062 

Breadth at B, ; -20484 


19471 + °00203 


a b, : "20830 +°00337 


‘20167 — 00326 19126 — 00142 

* These dimensions were derived from the numbers in the preceding tables by multiplying by 
0:0016, the value of a micrometer division in inches ; and that was ascertained by observing an 
accurate inch ivory scale placed in contact with the slit through which the flame was viewed. 
