( 54<5 ) 
It appearing by the Experiments made at Tfeffers, 
that from 9 t" the Barometer defcends to 24", 
11 > that is, juft 10 Lines, for the Height of 714 
Fee^ *and the Expanfions of the Air being reciprocally 
as the Heights of Mercury, my Uncle, Dr. John 
Scheuchzer, undertook, purfuant to thefe Principle?} 
and the Properties of the Hyperbola, to calculate a 
new Table, after the following Method. 
• * 1 
As the Difference 
of the Logarithms 
of the two given 
Heights of the Ba- 
rometei 2,7 p 7 
and 14" 1 1 7 that 
is 309! and 2pp 
or 
So the Difference 
of the Logarithms 
of the Height of 
Mercury near the 
Sea, 28" 1 "' to 
any leffer Height, 
as for Inltance 28" 
o'", that is 33 7 
— 336, oi- 
ls to Foot 
To the Height of 
the Atmofphere 
above the Level 
of the Sea, as it 
anfwers to one 
Line of Mercury, 
is 
518 — 898 IOII— 1008 
141717 7*4 , 11906 
6 j, 6 ", 9"' 
Thus the Height of the Atmofphere at 28" appears 
to be of io°, 4 , 6", 9"', but, according to Mariotle , 
it is only of io°, 3 or 63 Feet, and CaJJini fuppofes it 
only at io°, or 60 Foot. 
In like Manner the Height of the Atmofphere, from 
28", o'", to 27", ix is found to be 64', 9", 2"'. 
According to the fame Rule half the Height of the At- 
mofphere, that is, the Height of the Place, where the 
Mercury in the Barometer would defend to 14 Inches, 
appears to be, 15060', 3". o'",or25io°, o', 3", o'". 
Still upon the fame Principle the Mercury will defend 
to one Line at the Height of 133)397 1 civis Feet 
above the Level of the Sea, which make 22,232 Toifes, 
5 Feet, 
