384 Mr. R. H. M. Bosanquet on the Relation between the 



the three middle observations, which agree closely. This is 

 easily explained, and the rejection of the observation for our 

 purposes justified as follows: — The largest bass pipesof the manual 

 in an organ have almost unavoidably a deficient supply of wind. 

 In consequence of the heaviness of the touch caused by large 

 valves, the valves and, therefore, the wind admitted by them are 

 limited in size and quantity respectively ; and as this limited 

 amount of wind has to be distributed amongst a number of large 

 pipes, each has to put up with less than a full supply; and it is 

 well known that the power of the bass invariably suffers more or 

 less in consequence of this difficulty. 



The number for c^" is rejected because the quantity to be ob- 

 served is in that case too small, with reference to the method of 

 observation, for accurate results. 



So far as the above ^ight observations went, they appeared, then, 

 to corroborate Topf /s law. But with the view of ascertaining 

 more exactly how f / the uniformity sought for prevails, I subse- 

 quently observed the wind-consumption of each pipe from tenor 

 C (cq) to treble C (c") inclusive. Several months had elapsed and 

 the organ been tuned, which must account for the difference in 

 the relative behaviour of the C pipes on the two occasions. 



The results are as follows : — 









1 1 



W 









a. 



b. 



b a 



V=i 







f^o 



143 



Ill 



201 



50-2 



f+6-3 

 OS -1-8 





r+ 7-3 



^ot 



153 



123 



159 



421 





- 0-8 



V 



159 



125 



171 



480 



w +4.1 





+ 51 



e,^ 



159 



128 



152 



45-2 



1 ^ 



+ 13 





+ 2-3 



^0 



149 



127 



115 



36-4 



^1.. 



-7-5 





- 6-5 



/o 



158 



132 



124 



41-4 





-2-5 



. 



- 1-5 



M 



159 



137 



101 



35-7 





f-6-2 



9 



- 6-2 



ffo^ 



1.52 



130 



111 



41-6 





-0-3 



7 ' 



- 1-3 



^J? 



148 



129 



99-5 



393 



ci 



-26 



^l*- 



- 3-6 



«0 



160 



134 



121 



50-9 



1 < 



+9-0 



+4-8 



1-4-4 



+ 8-0 



*ob 



166 



126 



191 







^0 



152 



132 



99-7 



46-7 



+ 3-8 

 I- 5-4 



c' 



154 



K^8 



753 



37-5 







^'# 



163 



143 



85-8 



45-4 





(-2-6 





{- 18 



d' 



168 



145 



94-5 



530 



e 



+5-0 





+ 6-8 



e'\> 



161 



141 



88-1 



524 





+ 4-4 





+ 5-2 



e' 



162 



145 



72-4 



45-6 



1 



-24 





- 1-6 



f 



166 



149 



68-7 



45-8 



^U 



-22 



^^ 



- \'i 



f'fi 

 9 



165 



149 



650 



45-7 





t-2-3 



1 



- 15 



162 



150 



494 



370 





r-94 



-10-2 



a'b 



170 



154 



61-2 



48-6 



"^ 



+2-2 



^[b 



+ 1-4 



a' 



168 



152 



627 



52-7 



7 - 



+6-3 





+ 55 



b'\> 



164 



152 



481 



42-8 



-3-6 





- 44 



b' 



162 



149 



53-8 



50-8 



^Iv- 



4-4-4 





4- 3-6 



c" 



171 



158 



46-9 



46-9 





t+0-5 





- 0-3 



