[ 47> ] ^ 



Ufes of this Talk. 



10. To find the approximate height of any elevation in tempe- 

 rature 32**, the heights of the barometers above and below being 

 given. 



SuBSTRACT the number of feet oppofite to the lower barome- 

 trical height, from thofe oppofite to the upper, the remainder is the 

 approximate^ height very nearly. For as only one decimal place is 

 given, there is no room for a corredion. 



Example. 



Thus at the bottom of Mount Saleve a barometer flood at 

 28,39 inches (fay 28,4) and at the top at 25,7 inches. Now in the 

 table we have oppofite to 25,7 inches 5713,0 feet, and oppofite 

 to 28,4 we have 3109,9' feet. Now 5713,0 — 3109,9=2603,1 

 feet, and Schuckburg makes it =2602,878 feet. 



Supplemental Height. 



Multiply the fundamental difference of heat, into the appiox- 

 imate height, and divide the produd by 450, if the height does 

 not txceed 8000 feet; if it does, Ii4ofhould be the divifor, the 

 quotient is the fupplemental height. 



3N2 ' Thus 



