66 MENSURATION OF 



fat you have al the heght fro F to f e erthe. me- 

 sure f e length AC to f e erth. whilk length set 

 to f e heght CBF and fat comes is f e verey heght. 

 If you wilt mesure f e heght of any thyng by 

 a myrure. lay f e myrure in f e playne grounde, 

 and go toward and froward til you se f e toppe of 

 fat thing in f e mydel of fat myrure. fan mul- 

 tiply f e playne bitwene f e foundement of fat 

 thyng to be mesured and f e myrure by f e space 

 fro f ethen to f e erthe. and fat comes f ereof de- 

 parte by f e space bytwene f i fote and f e myroure 

 and f e nonmbre howe ofte it be es f e heght of 

 fat thyng. Also als fro f ethen to f e erthe has it 

 to f e space bytwene f i fote and f e myrure so f e 

 heght of fat thyng has it to f e playne. Whilk es 

 bitwene f e rote of fat thyng to be mesured and f e 

 myrure and so ageyne. 



Nowe we have taght to mesure the heght of a 

 thynge whilk es the first parte of oure tretis. We 

 wil teche to mesure the playne. for that es the se- 

 conde parte. 



When you wilt mesure f e length of any playne 

 with f e quadrant stonde in one ende of f e playne 

 and byholde fat of er by bothe holes, and holde f e 

 cone, fat es to say f e cornelle of f e quadrant nere 

 fin eigh. and f e compas toward f e playne to be 

 mesured. fan when you sees f e of er ende of fat 

 playne take f e nonmbre of f e poyntes of f e vmbre 

 froward whilk f e perpendicle kyttes, fan multeply 



