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In the tangents, the index 9 be- 0 
longs to all between 47 
/ 
42 10 
And the indices, 8, 7, 6, &c. 
fall as in the fines. 
In the verfed fines, the index 0 , 6 , 
1 o belongs to all between 180 o and 90 o 
Now, as the length of the Gunter’s fcale admits 
of no more than two radii, or of fuch numbers only, 
whofe index differs by unity ; therefore, within this 
length, no more of the fines, tangents, or verfed fines, 
can be introduced, than thofe, whofe index differs by 
unity : And as not only the greateft number among 
the fines and tangents, but alfo thofe more generally 
wanted, have the indices 9 and 8 differing by unity j 
therefore all the fines from 90° to o° 34', and all the 
tangents from 45 0 to o° 34', are thofe only, which 
are put on thefe fcales ; the divifions anfwering to 
the leffer fines and tangents being omitted for want of 
room. And this is the reafon, why the fine of 90°, 
and the tangent of 45- are limited by the fame ter- 
mination as the fecond radius on the line of numbers. 
To conftruB the line of logarithmic fines. 
From the fcale of equal parts, take the numbers 
expreffing the arithmetical complements of the log. 
fines 
9 
8 
7 
6 
90 o and 25 71 
27 51 and 8 7 
8 7 and 2 34 
2 4 and o 47 
&c. 
1 
