70 MENSURATION OF 



you sale calle it E. fan multiply f e length of f i 

 stondynge fro f e jerde by f e quantite bytwene 

 f e myrure and f e playne. and departe fat comes 

 f ereof by f e distaunce of f e myrure fro f e hyere 

 parte of f e rod. and fat nonmbre howe ofte it be 

 es f e length of fat playne. as f us. multiply AE in 

 AC and depart fat comes f ereof by f e lyne CB. 

 and f e nonmbre fat comes f ereof es f e length of 

 f e playne. 



Nowe we have taght to mesure the playnes of 

 ilk erihly thyng whilk es the secunde parte of 

 this tretyse. So we teche to mesure the depnes. 

 for that es the thrid parte and laste of this boke. 



When you wille mesure f e depnes of a welle. 

 loke fro fat one side of f e welle to }?e ende of f>at 

 oj?er syde in f>e bothome of f>e same welle with Ipe 

 quadrant, and holde J?e cornel of }?e quadrant nere 

 fine eigh. and f>e circumferens toward J?e welle 

 and take hede what es f>e nonmbre of f>e poyntes 

 of }?e vmbre toward vpon whilk j?e perpendicle 

 falles. fan mesure \ e diameter of J? e pit or welle. 

 fat es to say f e mouthes brede. and multiply fat 

 by 12 and depart fat comes f ereof by f e nonmbre 

 of f e forsaide poyntes and howe ofte fat nonmbre 

 be. it es f e depnes of fat pitte. Also for f e same, 

 rayse vp a table on f e mouthe of f e welle. fan put 

 vpon f e table a reulure whereby biholde you f e 

 ende on f e bothome f ereof. fan make f er a lyne 

 by fat reulure. est put f e reulure in anof er place 



