64 MENSURATION OP 



and of pat thyng. J?an loke* howe mikil es bi- 

 twene pi fote and pe grounde of J?at pyng in pe 

 tyme of beholdynge. and to pat length set pe 

 space fro j?ethen to pe erthe. J?an multiply al J?at 

 by pe length of pe jerde. and j?an departe al }?at 

 by pe space bitwene ye and pe gerde and here- 

 with pe quantite fro }?ethen to pe erthe. and 

 J?at es pe heght. Also when you wilt mesure 

 pe heght of any thing by two gerds, even cor- 

 neldly joyned, take a gerde even to pe length of 

 j?i stature, and ano]?er gerde, tuo so longe als 

 J?at in pe myddel of pe lengere gerde, set pe 

 schortere even corneldely fan )?is instrument ]?us 

 made layde by pe playne ground til by pe toppes 

 of bothe pe gerdes you se pe toppe of the J?ing 

 to be mesured, )?an make J?ere a mark and set 

 J>ereto Jri stature, and j?an set pe marke j?ere. 

 and so heigh es J>at thyng howe mekil length es 

 bitwene pe grounde of J?at thyng and pe latter 

 mark, bot forgete noght J?at perpendicle or equi- 

 pendy, J?at es to say, even hangere lolle by pe 

 toppe of pe longer rodde to schewe when J?in 

 instrument es even vpright, and when it bagges 

 Ensample, pe stature of pe matere be called AB, 

 pe gerde doubling it CD pe gerde evene cor- 

 neldy joyned to it AE, and the foundement of 

 pe pyng ¥, J?an I say pe height of the pyng es BF, 

 with pe quantite of BC. When you standes by 

 a walle of a castelle or toure, and you wolde 

 mesure pe heght of it with outen defaute, make 



1 MS. loloke. 



