To deuide any measurable line into ij. equall partes.
[Illustration]
Open your compasse to the iust length of y^e line. And then set
one foote steddely at the one ende of the line, & w^t the other
fote draw an arch of a circle against y^e midle of the line,
both ouer it, and also vnder it, then doo lykewaise at the other
ende of the line. And marke where those arche lines do meet
crosse waies, and betwene those ij. pricks draw a line, and it
shall cut the first line in two equall portions.
_Example._
The lyne is A.B. accordyng to which I open the compasse and make
.iiij. arche lines, whiche meete in C. and D, then drawe I a
lyne from C, so haue I my purpose.
This conlusion serueth for makyng of quadrates and squires,
beside many other commodities, howebeit it maye bee don more
readylye by this conclusion that foloweth nexte.