-*I4^ ) I7<5 ( ^G?- 



AP R acqnali^, eritquc R P r — 90°, ideoqiie f ccntriim 

 nfiendiani qiiaefiti in mappa P' R P. Eric igittir 



K r — K P tang. K P r r= 2 cofcc. b cot. $ , 



hincqiie radius 



P r rr P' r — 2 cofec. h cofec. ^. 



Harum formularum ope facile erit pro quacnnque decll- 

 natione ^ meridianum in proietfiionc defcnbcre, hocque 

 inodo omnia abfoluimus, quac vulgo in tradationc pro 

 iedionis ftereographicae occurrere (olent. Opcrac igitur 

 prctium vidctur, haec omnia ad proiedionem polarcm et 

 aequatoream applicare , tabulasque adiungcre , quarum ope 

 conrtrucfbio mapparum his proicdionibus fupcrftiudarum 

 fubleuetur. 



^ ProlcQio polarls. 



Rg. t\ % 11. Quod fi iam ftatuatur polus in ipfo zetiith 



A, ita vt kp — hzzo^ et quacratur proiedio parailclo- 

 Yxtm et meridianorum , figiira prima huic cafui cft accorr»- 

 modata. Pofita enim pro loco quocunqne z cieiiationc 

 poH Az — gy crit rcda AZ proiedio mcridiani loci z ct 

 fimul radius parallcli zy^ in proiedionc, cuius vaior cfl 

 A Z — 2 tang. ; ^, -ob h — c. Tum vcro erit radius mc- 

 ridiani 2 coiec. /^ cofec. ^ — cxd. Haec igitur proicdio 

 cui conftrucndae prima tabula inferuict, refcrt hcmifphae- 

 . rium poiarc, vbi omnes rccflae cx A cdudac funt meii- 

 diari, paralleli vero circuli concentrici cx A radio zz: 

 a tang. ^ £ dcfciipti , exiHcntc radio paralleli in fphaera 



