Burn, Robert Scott · London : Ingram, Cooke, and Co. · leaf 110
fig.6.9* In fig. 69, it must be noted that there are two feet of the luminary;F2 being the foot as regards the horizontal shadow-plane of the ground, andFl that for shadows on the vertical plane of the wall. The shadow of each … 102 ILLUSTRATED LONDON DRAWING-BOOK. point of the buttress is found by drawing through the foot of that point onthe shadow-plane a line from therespective foot of the luminary, and in-tersecting it by a ray from the luminary through the point whose shadowis required. F2 is on the horizontal line,…
Drawing · Wood-engraving
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Libro primo [-quinto] d'architettvra ... (1566)](https://img.insideoutlibrary.com/img/200/ia-libroprimoquinto00serl-88-112.webp)
