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.