343 



CONTENTS. 



(The figures refer to the folio at the bottom of the page.) 



1. Barometrical Measurement of Heights. 



Page 



On the Tables and Formulae ......... 7 



Tables based on Lajilace's Constants 



Table I. Delcros' Tables, in Metrical Measures '9 



" II. Guyot's Tables, in English Measures . . . . . 31 



" III. Loomis' Tables, in English Measures 47 



" IV. Gauss' Tables, modified by Dippe, Old French Measures . 52 



" V. Dippe's Tables, for reducing Barometrical Observations to another 



Level, and for computing Heights, Old French Measures . 58 



" VI. Babinet's Modification of Laplace's Formula .... 66 



" VII. Baily's Tables, in English Measures 67 



Tables based on BesseFs Formula. 

 " VIII. Plantamour's Tables, in Metrical Measures .... 70 



Miscellaneous Tables, 

 " IX. Correction for the Hour of the Day at which the Observations have 



been taken, Coefficients by Berghaus 78 



" X. Correction for the Hour of the Day, Old French Measures . 79 

 " XI. Correction to be applied to the Half-Sums of the Temperatures 

 observed at Geneva and St. Bernard, and its Value in Metres at 

 all Hours and Seasons of the Year, by Plantamour . . 80 

 Computing Altitudes by the Height of the Barometer at the Sea- 

 Level 81 



" XII. Mean Height of the Barometer at the Level of the Sea in various 



Latitudes 83 



" XIII. Mean Height of the Barometer in all Months of the Year . . 84 

 " XIV. Mean Height of the Barometer at all Hours of the Day . . 84 

 " XV. Tropic Hours of Daily Variation at Halle . . . .85 



" XV'. Amplitude of Daily Variatioiis in Various Latitudes . . 85 

 Reducing the Barometer to the Level of the Sea . . .86 

 " XVI. Height, in English Feet, of a Column of Air corresponding to a 



Tenth of an Inch in the Barometer 87 



•' XVII. Height, in French Feet, of a Column of Air corresponding to a 



Paris Line in the Barometer 87 



D 3 



