ANNALS 



OF 



PHILOSOPHY. 



SEPTEMBER, l^^^"^ "' ' *"*''^ 



Article L 



An Abridged Tramlation of M. Ramond's Instrnctions for the 

 Application of the Barometer to the Measurement of Heights^ 

 with a Selection from his Tables for facilitating those Opera- 

 tionSy reduced {where necessary) to English Measures, By 

 Baden Powell, MA. of Oriel College, Oxford. 



(Continued from p. 111.) 



It is from the publication of the excellent work of M. Be Luc 

 on the Modifications of the Atmosphere, that we are to date the 

 commencement of those observations which have really contri- 

 buted to the advancement of our knowledge. With these sub- 

 sequent additions, a work on the mode of using meteorological 

 instruments would assuredly be highly useful, for the experi- 

 mental part of the science has been far from keeping pace with 

 the mathematical ; and the art of making good observations is 

 as yet far from being carried to the same perfection as that of 

 employing them when made. 



It is, therefore, not useless to apprize those to whom these 

 instructions are addressed, that if exactness is the first requisite 

 in a good observation considered in itself, there are also other 

 conditions to be fulfilled, in order to appropriate that observation 

 to the particular purpose in view : that both meteorology and 

 barometrical measurements require the choice of opportune con- 

 junctures : that the laws of general physics lay down the prin- 

 ciples, but do not always point out their applications : that these 

 are not within the province of dogmatical instruction ; that in 

 order to effect happy applications, there must be much skill, 



Neiv Series, vol. vi. u 



