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 214
of pitch forthe common rafter. To find the same for thereversed pitches, it is only necessary to subtractthe degrees here given from 90°. I may have to revert to the subject of pitchesagain, as there are still some points on the sub-ject, from a workingmans point of view, that willbear further… … explanation. Here the rafter is shown inposition, with the square shown on each footof the run of the rafter; also the rise for eachfoot. The illustration shows a rise of 4 feet or48 inches in a run of 6 feet or 72 inches. Thesquare is applied upon the line representing thecenter of the rafter, and…
Carpenters' squares · Architecture, Domestic · Equerre de charpentier
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