CONTENTS. 



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



1. Barometrical Measurement of Heights. 

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



Tables based on Laplace^s Constants 



Table I. Delcros's Tables, in Metrical Measures . . . . .11 



" II. Guyot's Tables, in English Measures 33 



" III. Loomis's Tables, in English Measures . . . . .49 



" IV. Gauss's Tables, modified by Dippe, Old French Measures . 54 



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



Level, and for computing Heights, Old French Measures . 60 



" VI. Babinet's Modification of Laplace's Formula .... 68 



" VII. Baily's Tables, in English Measures 69 



Tables based on BesseVs Formula. 



" VIII. Plantamour's Tables, in Metrical Measures .... 72 



Miscellaneous Tables. 



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



been taken. Coefficients by Berghaus . . , . .80 



" X. Correction for the Hour of the Day, Old French Measures . 81 



" 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 . . 82 

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

 Level 83 



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



Latitudes .......... 85 



" XIII. Mean Height of the Barometer in all Months of the Year . . 86 



" XIV. Mean Height of the Barom.eter at all Hours of the Day . . 86 



" XV. Tropic Hours of Daily Variation at Halle 67 



Reducing the Barometer to the Level of the Sea ... 88 



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



Tenth of an Inch in the Barometer . . . . .69 



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



Paris Line in the Barometer 89 



D 3 



