Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 147
c F E till it reaches the point E, which is then projected to E^; supposethe given plane, now represented by M^ B, to turn upon that line as an axis,until it assumes a position parallel to the vertical plane, the point E^ which isdistant from the axis M B by the distance F S (Fig. 264), will now be… … ? n, H
Mechanical drawing
Internet Archive · Library of Congress · 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-182-20.webp)
