The rudiments of practical bricklaying : in six sections : general principles of bricklaying, arch drawing, cutting, and setting, different kinds of pointing, paving, tiling, materials, slating, and plastering, practical geometry, mensuration, etc. (1882)
Hammond, Adam · London : C. Lockwood · leaf 109
s will complete the ellipsis. Another method of describing an ellipse. Let A B, c D, be the given diameters drawn at right angles with each other. Then with c as centre with a o as radius describe an arc cutting A B at e and /; then take a piece of string or very lino wire the length of a b, fix…
Bricklaying · Plastering · Masonry
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.