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 133
want to takefigures which are as large as possible, so as toreduce the possible error in measurement to thesmallest possible dimensions. Let us take fordimensions 9, 12 and 15 inches. That these willserve is easily demonstrated. The square of 9is 81. The square of 12 is 144. The sum ofthese squares… … Fig. 77 side of the blade, as shown in Fig. yy, it will beproof that the square is correct. It may be somewhat difficult to makea measurement of this kind on the in-strument itself, with sufficient accuracyto be beyond dispute. I suggest, there-fore, that thesquare be laid flatupon an even…
Carpenters' squares · Architecture, Domestic · Equerre de charpentier
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