Maltby, Albert Elias, 1850- [from old catalog] · Slippery Rock, Pa., The Signal · leaf 38
109 110 111 ercise in the same relative position as at first, and the paper should not be lifted from the desk. Thelessons and the accompanying directions are so arranged that the papers are to be placed in one
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![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-215-23.webp)
