Jopling, Joseph, Gladwin, George, fl. 1821-1838 · London : M. Taylor · leaf 75
69 1SOMETRICAL PERSPECTIVE. Figs. 128 and 129 are the representations of pentagonal sections. As in a regular pentagon one side is not parallel Fig. 128. … Fig. 129. to another, a cube cannot be cut by a plane to form such a figure. For if a b and cd , or db and c e , in either of these figures, were not parallel to each other, they could not be in the same plane, as has been explained in the description of figs. 73 and 74. From what has just before…
Axonometric projection · Perspective
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Practical perspective; or, Perspective made easie. Teaching by the opticks, how to delineate all bodies, buildings, or landskips, &c. By the catoptricks, how to delineate confused appearances, so as when seen in a mirror or pollisht body of any intended shape, the reflection shall shew a designe. By the dioptircks [sic], how to draw parts of many figures into one, when seen through a glass or christal cut into many faces.. (1670)](https://img.insideoutlibrary.com/img/200/ia-practicalperspec00moxo-83-0.webp)
