ramis £CF habuit. Qucd , fi lamella ultra C pro-sgrediatur verfus D ftatim imminuecur bafis EH, ex E incipiendo verfus G, do-nec lamella proxime ad D pervenerit: cunc enim lucebtr (ola pyramis G DH di~flincle quidem,fed non impense,quia bafim (uam G H fola absque akerius corE-fortio conftituit.… … PORISMA, 104 FUNDAMENTUM I. PhYSICUM SEU NATURALE. PORISMA, impcntiorcolluftra-tio fit ob4. caufasr»
Optics, Geometrical · Optical instruments
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