[ 101 ] 
to be taken from the fcale of equal parts, for the de- 
grees they fiand againft. 
S 33 J§ 3 Q 
Supplements 
of 
Verfed Sines 
Degrees 
Supplem n s 
of 
Verfed Sines 
Decrees 
Supplements 
of 
Verfed Sines 
l8o 
0,00000 
1 20 
0,1 2+94 
60 
0,00206 
I70 
°>°° 33 I 
1 10 
0,1^3 7 
0 
4 * 
CO 
1— < 
O 
l6o 
0,01330 
100 
0,23149 
40 
0,93190 
I 5 0 
0,0301 1 
9 ° 
0,30103 
3 ° 
I , l 740 I 
I4O 
o,o 5-403 
80 
0,38387 
20 
1,52066 
I30 
0,085-45- 
7 ° 
0,48282 
} 0 
2,2 1 94I 
From this table it appears, that the lead; verfed 
fine, which can be introduced within the length of 
a double radius, falls between io° and 20°, where 
the index changes from 1 to 2 which will happen 
about ii° 28'. 
If a table of logarithm verfed fines to 1 8o p are want- 
ing, they are eafily made by the following rule. 
. \ 
Take the logarithm fine of 30 degrees from twice 
the logarithm fine of (A 7 ) any number of degrees ; 
the remainder is the logarithm verfed fine of 
(2 N y or) twice thofe degrees.” 
For it is a well-known goniometrical property, that 
the fine of any arc {A ) is a mean proportional be- 
tween radius ( R ) and half the verfed fine of twice 
that arc. 
Therefore, putting v for the verfed fine, and s for 
the fine 5 
The 
