page_title: Linear scale
section_title: Nomenclature
hierarchical_section_title: Linear scale / Nomenclature
caption_attribution_description: English: Floor Plans of Charles Adams - Woodbury Locke House, 178 Central Street, Somerville, MA as it existed in 1993.
context_page_description: A linear scale, also called a bar scale, scale bar, graphic scale, or graphical scale, is a means of visually showing the scale of a map, nautical chart, engineering drawing, or architectural drawing. A scale bar is common element of map layouts.
  On large scale maps and charts, those covering a small area, and engineering and architectural drawings, the linear scale can be very simple, a line marked at intervals to show the distance on the earth or object which the distance on the scale represents. A person using the map can use a pair of dividers to measure a distance by comparing it to the linear scale. The length of the line on the linear scale is equal to the distance represented on the earth multiplied by the map or chart's scale.
  In most projections, scale varies with latitude, so on small scale maps, covering large areas and a wide range of latitudes, the linear scale must show the scale for the range of latitudes covered by the map. One of these is shown below.
  Since most nautical charts are constructed using the Mercator projection whose scale varies substantially with latitude, linear scales are not used on charts with scales smaller than approximately 1/80,000.
context_section_description: The terms "bar scale", "graphic scale", "graphical scale", "linear scale", and "scale" are all used. Bowditch defined only "bar scale" in its 1962 Glossary, but added a reference to "graphic scale" by its 2002 edition. Dutton used both terms in 1978. The International Hydrographic Organization's Chart No. 1 uses only "linear scale". The British Admiralty's Mariner's Handbook uses "scale" to describe a linear scale and avoids confusion by using "natural scale" for the fraction defined at scale (map).
caption: An architectural drawing with a simple linear scale showing feet and half feet.
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