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 103
PRACTICAL GEOMETRY AXD MENSURATION. 87 passing IL rough the centre and terminated both … parts each containing 180 degrees. Any h*ne drawn from the centre perpendicular to A B, it divides the semicircle into two equal parts, AOS and bos, each of which is called a quadrant, or one-fourth of a circle ; and the arcs A s and B s contain each 90 degrees ; and they are said to be the measure…
Bricklaying · Plastering · Masonry
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
