# Slide chart

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Hand-held device for reference or calculation

A "Curveasy" slide chart for spherical geometry calculations

A **slide chart** is a hand-held device, usually of [paper](/source/Paper), [cardboard](/source/Cardboard), or [plastic](/source/Plastic), for conducting simple calculations or looking up information. A circular slide chart is sometimes referred to as a wheel chart or [volvelle](/source/Volvelle).

Unlike other hand-held mechanical calculating devices such as [slide rules](/source/Slide_rules) and [addiators](/source/Addiator), which have been replaced by [electronic calculators](/source/Electronic_calculators) and [computer software](/source/Computer_software), wheel charts and slide charts have survived to the present time. There are a number of companies who design and manufacture these devices.

Unlike the general-purpose [mechanical calculators](/source/Mechanical_calculator), slide charts are typically devoted to carrying out a particular specialized calculation, or displaying information on a single product or a particular process. For example, the "Curveasy" wheel chart displays information related to spherical geometry calculations, and the Prestolog calculator is used for cost/profit calculations. Another example of a wheel chart is the [planisphere](/source/Planisphere), which shows the location of [stars](/source/Star) in the [sky](/source/Sky) for a given location, date, and time.

Slide charts are often associated with particular sports, political campaigns or commercial companies. For example, a pharmaceutical company may create wheel charts printed with their company name and product information for distribution to medical practitioners.

Slide charts are common collectables.

## See also

- The [E6B](/source/E6B) aviation flight computing device, still in regular use

## References

- *Reinventing the Wheel*, [Jessica Helfand](/source/Jessica_Helfand), Princeton Architectural Press, 2002. ([ISBN](/source/ISBN_(identifier)) [978-1-56898-596-1](https://en.wikipedia.org/wiki/Special:BookSources/978-1-56898-596-1))

## External links

- [Slide Chart Examples](https://archive.today/20121216154456/http://www.tinajuliecordon.webspace.virginmedia.com/Slide%20Rules/SlideCharts.html)

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Adapted from the Wikipedia article [Slide chart](https://en.wikipedia.org/wiki/Slide_chart) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Slide_chart?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.