178 POPULAR LECTURES AND ADDRESSES. 



Proceedings for those 

 years ; l also reprinted, with 

 a postscript dated April 

 1879, in Thomson and 

 Tait's Natural Philosophy, 

 Second Edition, Appendix 

 B. It remains now to 

 describe and explain the 

 actual machine referred to 

 in the last of these com- 

 munications, which is the 

 only tidal harmonic an- 

 alyser hitherto made. It 

 may be mentioned, how- 

 ever, in passing, that a 

 similar instrument, with 

 the simpler construction 

 wanted for the simpler har- 

 monic analysis of ordinary 

 meteorological phenomena, 

 has been constructed for the 



1 Vide vol. xxiv. p. 262, and vol. 

 xxvii. p. 371. 



