the mesures be-tween the prikkes be twyes or thryes the heyghte of
the tour.
[43a.] Ad cognoscendum altitudinem alicuius rei per umbram rectam.
To knowe the heyghte of thinges, yif thou mayst nat come to the
bas of a thing. Sette thy rewle upon what thou wilt, so that thou may
see the top of the thing thorw the two holes, and make a marke ther
thy foot standeth; and go neer or forther, til thou mayst see thorw
5
another poynt, and marke ther a-nother marke. And loke than what
is the differense be-twen the two poyntes in the scale; and right as