. is the pricke where I would haue the plumbe
line to light. Therfore I meate out two equall distaunces on
eche side of that pricke B. and they are A.C. Then open I the
compas as wide as A.C. and settyng one of the feete in A. with
the other I drawe an arche line which goeth by G. Like waies I
set one foote of the compas steddily in C. and with the other I
drawe an arche line, goyng by G. also. Now consideryng that G.
is the pricke of their meetyng, it shall be also the poinct fro
whiche I must drawe the plumbe line. Then draw I a right line
from G. to B. and so haue mine intent. Now as A.B.C. hath a
plumbe line erected on his vtter bought, so may I erect a plumbe
line on the inner bught of D.E.F, doynge with it as I did with
the other, that is to saye, fyrste settyng forthe the pricke
where the plumbe line shall light, which is E, and then markyng
one other on eche syde, as are D. and F. And then proceding as I
dyd in the example before.

THE VIII. CONCLVSYON.

How to deuide the arche of a circle into two equall partes,
without measuring the arche.

Deuide the corde of that line info ij. equall portions, and then
from the middle prycke erecte a plumbe line, and it shal parte
that arche in the middle.

[Illustration]

_Example._

The arch to be diuided ys A.D.C, the corde is A.B.C, this corde
is diuided in the middle with B, from which prick if I erect a
plum line as B.D, then will it diuide the arch in the middle,
that is to say, in D.

THE IX. CONCLVSION.

To do the same thynge other wise. And for shortenes of worke, if
you wyl make a plumbe line without much labour, you may do it
with your squyre, so that it be iustly made, for yf you applye
the edge of the squyre to the line in which the prick is, and
foresee the very corner of the squyre doo touche the pricke. And
than frome that corner if you drawe a lyne by the other edge of
the squyre, yt will be perpendicular to the former line.

[Illustration]

_Example._

A.B. is the line, on which I wold make the plumme line, or
perpendicular. And therefore I marke the prick, from which the
plumbe lyne muste rise, which here is C. Then do I sette one edg
of my squyre (that is B.C.) to the line A.B, so at the corner of
the squyre do touche C. iustly. And from C. I drawe a line by
the other edge of the squire, (which is C.D.) And so haue I made
the plumme line D.C, which I sought for.

THE X. CONCLVSION.

How to do the same thinge an other