344 



CONTENTS. 



JL ig 



TABLE XVIII. Height, in Metres, of a Column of Air corresponding to a 



Millimetre in the Barometer 87 



" XIX. Height, in Metres, of a Column of Air corresponding to a Mil- 



limetre in the Barometer at different Temperatures and Ele- 

 vations ' ' ... " - . . . . . . . . 89 



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

 a Tenth of an Inch in the Barometer, at different Tempera- 

 tures and Elevations . f - "* . . . . 90 



" XX. Correction to be applied to the Means of the Hours of Observation 



to obtain the True Mean Barometical Pressure, Philadelphia 91 

 XXI. Correction to be applied to the Means of the Hours of Observa- 

 tion to obtain the true Mean Barometrical Pressure, Greenwich 92 

 XXII. For reducing Minutes into Decimals of an Hour ... 93 

 " XXIII. Correction for Curvature and Refraction . . , .94 



2. THERMOMETRICAL MEASUREMENT OF HEIGHTS. 



" XXIV. Regnault's Barometric Pressures corresponding to the Tempera- 

 ture of Boiling Water 'V . M .... 98 



" XXV. Regnault's Barometric Pressures corresponding to the Tempera- 

 ture of Boiling Water, revised by Moritz, in Metrical Measures 102 



" XXVI. Regnaulf s Barometric Pressures corresponding to the Tempera- 

 ture of Boiling Water, revised by Moritz, in English Measures 104 



D 



