how-ever, and add the curved linesas at G; also the outerstraight lines parallel withthe inner triangle. Erase thedotted lines. Thus you obtaina new design. You might, ina similar manner, take anotherstep, and obtain a third design; and so on. This illustrates what was meant when it was saidthat… … JliACTlVAL lJ£iil(JN. 113 tains the one at F, while further analysis would ditclose others contained in F.
Drawing -- Study and teaching
Internet Archive · New York Public Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-276-30.webp)
