To diuide an angle of right lines into ij. equal partes.
First open your compasse as largely as you can, so that it do
not excede the length of the shortest line y^t incloseth the
angle. Then set one foote of the compasse in the verye point of
the angle, and with the other fote draw a compassed arch from the
one lyne of the angle to the other, that arch shall you deuide
in halfe, and then draw a line from the angle to y^e middle of y^e
arch, and so y^e angle is diuided into ij. equall partes.
[Illustration]
_Example._
Let the triangle be A.B.C, then set I one foot of y^e compasse in
B, and with the other I draw y^e arch D.E, which I part into ij.
equall parts in F, and then draw a line from B, to F, & so I haue
mine intent.