Scale ruler
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A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering
A flat scale ruler with multiple scales
A triangular architect's scale, made of brass
Boxed set of 1850s ivory engineer's scales presented to the railway civil engineer George Turnbull in India. 16 scales are engraved.
Architectural drawing
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An architectural drawing or architect's drawing is a technical drawing of a building or building project that falls within the definition of architecture. Architectural drawings are used by architects
Scale ruler
…In common usage, both are referred to as a ruler. An architect's scale is a specialized ruler designed to facilitate the drafting and measuring of architectural drawings, such as floor plans and Multi-view orthographic projections. Because the scale of such drawings is often smaller than life-size, an architect's scale…
Luoyang Pavilion by Li Zhaodao (675–758)
Architectural drawing combining elevation, section and plan: drawings by Willey Reveley of Jeremy Bentham's proposal for a Panopticon prison, 1791
Perspective in the manner of the classic Ideal city by Jean-Max Albert, 1977
Two-point perspective, interior of Dercy House by Robert Adam, 1777