A practical treatise on the steel square and its application to everyday use : being an exhaustive collection of steel square problems and solutions, "old and new", with many original and useful additions, forming a complete encyclopedia of steel square knowledge, together with a brief history of the square, and description of tables, keys and other aids and attachments (1903)
Hodgson, Fred. T. (Frederick Thomas), 1836-1919 · Riverside, Ill. : Radford Architectural Co. · leaf 208
Fig. 152 Fig. 153 roof the angle of which is from twelve to sixteendegrees with the horizontal, as at Fig. 154, andthat the Roman pitch results in a roof the angleof which is from twenty-three to twenty-eight
Carpenters' squares · Architecture, Domestic · Equerre de charpentier
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
