200 DE NOVO MICROSCOPIORVM 



■\'bi pro m"crofcopiis fiimi folet kzzi<5, ct X, X', 

 7/'^ 'hf^^ 'h''^^' et X^ figurae fingularum lcntium dc- 

 fin-cnJiie infcruiunt , at v ell numcrus a refraclione 

 pendcns , cuius ratio fi fit i,54.:i crit proxime 

 ^1=0, ii6. 



8. Cum dcbcat effe 5>M, ne diftantia BC 

 prodeat ncgatiua , flatuamus Oi=:(i+«)M, eritque 

 M— ;;p^^ , hinc (J) rr ~^^ , ct diametcr fpatii 



Tum vero eft ^ ^'^\X%\ ^-"^-^u atqiie 



t>4-e-M=3-^ + Mr„Tf^; idcoquc X>-^^^-^ , 

 vndc noflrae determinationcs pro conlkudione mi- 

 croscopii ita fc habebunt : 



Diam. apcrt. Intcrualla 



p- ao; PPri.Vi AB-Aa 



^-A.,-f^; QQ^-IA. ;jrr:prM'BC=A. ^- 



r=Ac.:-; RRziV^ CD = AC^^i 



x-ACb.^; SSn^x; DE-AC.-^^-^s 



t-kQ.T^^.^^r^x--,'^'^-^ EF=:AC. t:;:^. 4 



c'z:AC.Ti,.4; VV-'i; FOz'!^^^ 



et .V cx hac aequatione dcfiniri debct 

 1 w.v'a+va(i-a) X"^+vcfi-c) X"'-^t>(i4b) / 



- anl t a' + 



+ 



X' aal C a' ;;A'c' A^Cb' wa 



"^ A' C t>' ' w </S * 

 5>. Ilic 



