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The Ohio Journal of Science [Vol. XVIII, No. 5, 



The agreement between theory and experiment is remark- 

 ably good for 7/ = 8.0 cm., or for the mean values for 7/ = 7.15, 

 8.0 and 9.0 cm.*, as shown in Table II. Expressed in per cent 

 the largest error is nearly eleven per cent, but when, as here, 

 relative intensities are compared, it seems far more reasonable to 

 express the error in terms of the fundamental intensity. When 

 this is done the maximum error is less than one-half per cent. 

 In the experimental work, although we tried to read to fractions 

 of a division for small galvanometer throws, nevertheless such 

 things as the wandering of the zero during a reading, slight 

 unsteadiness of the zero particularly on windy days, together 

 with slight errors of experiment, mentioned above but unelim- 

 inated, served to make the experimental error as high as five 

 per cent, at least for the tones beyond the fifth. 



Table II. 



Expressed in per cent of the fundamental intensity the error 

 is thus small and we can accordingly say that a satisfactory 

 theory has been worked out to explain the observed curves of 

 Blake and Jackson's Figure 6. 



* The value of Kq/k used in Table II is not exactly the value given in Table I 

 of Blake and Jackson's paper. The calculation was made taking ko/k = 13.17 cm., 

 instead of 13.03 cm. This can affect our results but very little, for a change of 

 1 per cent in Ko/k with its consequent change in X affects the relative intensity 

 of the various tones from one to three per cent at most. The variation is not 

 always in the same direction for the different tones, however. 



Physical Laboratory, Ohio State University. 



