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An architect's scale is a specialized ruler designed to facilitate the drafting and measuring of architectural drawings, such as floor plans and orthographic projections. Because the scale of such drawings are often smaller than life-size, an architect's scale features multiple units of length and proportional length increments. For accuracy and longevity, the material used should be dimensionally stable and durable. Scales were traditionally made of wood, but today they are usually made of rigid plastic or aluminium. Architect's scales may be flat, with 4 scales, or have a symmetric 3-lobed cross-section, with 6 scales. ==United States and Imperial units== In the United States, and prior to metrification in Britain, Canada and Australia, architect's scales are/were marked as a ratio of x inches-to-the-foot (typically written as x"=1'-0"). For example one inch measured from a drawing with a scale of "one-inch-to-the-foot" is equivalent to one foot in the real world (a scale of 1:12) whereas one inch measured from a drawing with a scale of "two-inches-to-the-foot" is equivalent to six inches in the real world (a scale of 1:6). It is not to be confused with a true unitless ratio (inches to inches)-- a 1:5 architectural scale would be a 1:60 unitless scale. Typical scales used in the United States are: *Full scale, with inches divided into sixteenths of an inch The following scales are generally grouped in pairs using the same dual-numbered index line (one scale is read from the right, and the other scale is read from the left): *three-inches-to-the-foot (3"=1'-0") (ratio equivalent 1:4)/one-and-one-half-inch-to-the-foot ("=1'-0") (1:8) *one-inch-to-the-foot (1"=1'-0") (1:12)/one-half-inch-to-the-foot ("=1'-0") (1:24) *three-quarters-inch-to-the-foot ("=1'-0") (1:16)/three-eighths-inch-to-the-foot (3/8"=1'-0") (1:32) *one-quarter-inch-to-the-foot ("=1'-0") (1:48)/one-eighth-inch-to-the-foot ("=1'-0") (1:96) *three-sixteenths-inch-to-the-foot ("=1'-0") (1:64)/three-thirty-seconds-inch-to-the-foot ("=1'0") (1:128) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Architect's scale」の詳細全文を読む スポンサード リンク
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