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 135
still clearer by anotherillustration. It is common to say that 12 of theblade and 5 of the tongue is correct for theoctagon miter. How is this determined? InFig. 78 there is shown a quarter circle, XG,described from the center, C. Along the hori-zontal line, AB, the blade of the square is laidwith… … Fig. 78 to the center C, which is 12 of the blade, it willbe found that it cuts also 12 of the tongue. Ifwe complete the figure by erecting a perpendic-ular line from the point X, and intersecting itwith a horizontal line from G, thus establishingthe point O, it becomes very evident that CE isthe…
Carpenters' squares · Architecture, Domestic · Equerre de charpentier
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