Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 38
a drawingis \ size, 3 inches equals 1 foot, hence 3 inches is divided into 12 equalparts and each division represents one inch. If the smallest divisionon a scale represents -^(^ inch, the scale is said to read to xV inch. Scales are often divided into yV) A> to tV ^^c., for architectsand civil… … Fig. 31. Protractor and measuring angles, is made of steel, brass, horn, or paper. Whenmade of metal the central portion is cut out, Fig. 31, so that the drafts-man may see the drawing. The outer edge is divided into degrees 25 16 MECHANICAL DRAWING and tenths of degrees. To lay off the required…
Architecture · Building
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