Mr. Nixon on the Heights of the Ingleton Fells. 1 1 

 Depression of the Mercury in the Tubes of Barometers. 



Dec. 14, 1827. 



J. Ivory. 



II. Heights of some of the principal Beds of Ingleborough Hill 

 and Moughton Fell, Yorkshire. By John Nixon, Esq. 



To the Editors of the Philosophical Magazine and Annals. 

 Gentlemen, 

 TN the xith volume of the Annals of Philosophy, I pro- 

 * posed to the geologist the measurement, by one barome- 

 ter only, of the heights and dip of strata known to be nearly 

 horizontal, and furnished at the same time the requisite in- 

 structions and tables. From, the numerous measurements of 

 this description made by me in different parts of the north- 

 west of Yorkshire, I beg to transmit you a selection of such 

 as may serve to determine the thicknesses and dip of the prin- 

 cipal beds of Ingleborough Hill and Moughton Fell. 



Having carefully measured by trigonometry the heights of 

 the summits and other elevated parts of the hills, as well as of 

 different places at their bases, barometrical observations were 



* In the Supplement to the Encyclopaedia, Article Fluids, there is an 

 arithmetical blunder in each of these numbers, as will appear by having 

 recourse to the formula. I was obliged to notice this point on a former 

 occasion, in order to stop the triumph of an antagonist, who has stuck to 

 my skirts for a period of at least six years, and who seems to have great 

 confidence in the efficacy of the adage, If one way will not do, another will. 



C 2 regularly 



