qVATVOR LENTIVM. 237 



S.X. Quodfi ergo ponamus cznl ^ .q-{)i-\-i)M. 

 crlt ^-2(i-«M) et Cprr^-^^-ftV^w exincnte 

 Mcz^^^T^ feu M-^, et (pizMco, tuin 

 vero 



^/// — ^^— Ma CDzziTITZni^ra 



€t pro loco oculi F = r^r^ j quibus formulis 

 cum pnicccdcntibus comparandis patet pro cadem 

 multiplicatione eodcmqae campo aliquid lucri in lon- 

 gitudine tnbi obtincri poflTc. Pofito cnim vt fupra 

 f//— i8, n—S vt fit M— rV, repcritur 



p'=zloL- p''z^-Ua.; f''--Ua; p'''' = :^.0L 

 ABzia; BC = ^aj CD=:\la; BE — -:f,a. 



Z2. Qiiando autem lens obiccftiua efl: fimplex, 

 tum a tantum valorcm obtinet , vt liceat ponerc 

 (;:=l , vnde pofito qzz{fj-{- i)My vt iit d::z z 

 (i — «M) et Mzz^n^, , habebimus 



p" — ~-,a.i ABrra 



P^^-ho^ BC-^* 



/-c.^„;^^-'Ma; CDz:$5"^!a 



G s 3 <^uod- 



