HEIGHTS AND DISTANCES. 69 



ende F and B es f e ende on f is side f e ryvere. 

 pan go fro B poynte by an evene lyne with f is 

 quadrat, and fat f e reulure of fat lyne be oc- 

 thogonyely. fat es to say even corneldly bytwene 

 B and F til yu se est f e ende F by f e poyntes or 

 chippes D, B in f e quadrat, and calle G f e mark 

 in fe place of fe seconde site, fat es to say 

 stondynge fan howe mekil length es bitwene B 

 and G so mekil as fe brede bytwene B and F. 

 Also when you stondes by a ryvere and wille me- 

 sure fe brede of it. put fis quadrat vpon fe 

 erche nere f e ryvere. and biholde by f e lyne CB 

 f e ende on fat of er side f e ryvere whilk es called 

 F. fan move E hedire and f idere til you se f e 

 same ende F by DE noght changyng fe first 

 place of BC. fan biholde where E stondes bi- 

 twene A and B fan multiply DA into AB and de- 

 parte fat comes f ereof by AE and f e nonmbre 

 fat comes howe oft it be es f e brede of f e ryvere 

 whilk es BF. When you wilt mesure a playne by 

 a mesure. fan rayse vp right on f e playne a rod 

 of f e length fro fin eigh to f e erche. and calle 

 fat rod AB. on fat rod hange a litel myrure. and 

 ay f e lesse f e better, and f e place on f e rod 

 where f e myroure hanges calle C and f e playne to 

 be mesurede sale hight AD. fan stonde you vpon 

 f o playne bitwene f e myrure and f e ende of f e 

 length of fe playne. and loke in fe myrure 

 movyng toward and froward f e myrure til you 

 se fe ende of fe playne in fe mydille of the 

 myrure. fat place of f e playne where you stondes 



