60 . MENSURATION OF 



mesure for letting of water or summe of er thyng 

 bitwene. fan biholde f e heght f ereof by bothe pe 

 holes, and biholde pe nonmbre of pe poyntes of 

 pe vmbre toward, namely vpon whome pe per- 

 pendicle falles. fan set D for a mark in fat place 

 where you stondes fan. go ferre or nerre fat 

 thyng whos heght you sekes. and fat by an evene 

 lyne and beholde este pe forsaide heght by bothe 

 holes, fan fere stondyng seke pe nonmbre of pe 

 poyntes of pe vmbre toward, and set fere C for 

 anof er mark, fan mesure howe many fete are 

 bitwene p ise tuo markes D and C and kepe fat 

 wele in f i mynde. fan abate pe lesse nonmbre of 

 f ese tuo in f e vmbre toward fro f e more and kepe 

 wele fe difference bytwene fo tuo nonmbres. 

 fan multiplie by twelve fe distaunce bitwene 

 f e forsaide D and C and alle fat comes of fat 

 multeplyeng departe you by f e distaunce of fe 

 poyntes. and to fat fat leves over, set als mykel 

 as fro f ethen to f e erthe and fan sekirli you has 

 f e heght of fat thynge. bot loke f e holes of f i 

 quadrant be right straite and elles you may 

 lightly be deceyvede. Peraventure you standes 

 in an aley. and fe thyng fat you wolde mete 

 es vp on an hegh hille. first fan biholde fe 

 heghte of fe hille by both fe holes of fe 

 quadrant, and fat by tuo stondynges of D and 

 C as we taght nowe next bifore. and marke 

 fat wele in fi mynde. fan biholde in fe same 

 wise fe heght of the hille and of fat same 

 thyng togedire. fan abate fe heght of fe hille 



