( ) 
1 A Table dewing the Nutnber 
of Feet afcending, requir’d 
to make the Mercury fall to 
any given Height in the 
Tube, from 30 to 26 Inches 
As alfo the Number of Feel 
defcending , requir d tc 
maketheMercury rife, from 
30 to 31 Inches. 
A Table /hewing the 
Number of Feet re- 
quir’d to make the 
Mercury fall one Tenth 
of an Inch from any 
given Height in the 
Tube, from 31 to 26 
Inches. • 
In. Dec,! Feet Dec. [In. Dec 
Feet Dec.. 
4 £ 
75 
08 
4i 
74 
07 
4i 
1 6 * 08 * 10 
12 
47 
82 
17 
53 
a 5 
<5 1 
98 
36 
73 
10 
IV. Ex- 
