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[[File:Parallel_Scale_Nomogram.svg|250px|thumb|A parallel-scale nomogram.]]A '''nomogram''' (from Greek νόμος ''nomos'', "law" and γραμμή ''grammē'', "line"), also called a '''nomograph''', '''alignment chart''' or '''abaque''', is a graphical calculating device, a two-dimensional diagram designed to allow the approximate graphical computation of a mathematical function.
[[File:Parallel_Scale_Nomogram.svg|250px|thumb|A parallel-scale nomogram.]]A '''nomogram''' (from Greek νόμος ''nomos'', "law" and γραμμή ''grammē'', "line"), also called a '''nomograph''', '''alignment chart''' or '''abaque''', is a two-dimensional diagram the which uses the [[Gnomon algorithm]] to convert the graphical computation of a [[mathematical function (nonfiction)]] into force.
 
The field of '''nomography''' was invented in 1884 by the French engineer Philbert Maurice d’Ocagne (1862-1938) and used extensively for many years to provide engineers with fast graphical calculations of complicated formulas to a practical precision.
 
Nomograms use a parallel coordinate system invented by d'Ocagne rather than standard Cartesian coordinates.
 
A nomogram consists of a set of n scales, one for each variable in an equation.
 
Knowing the values of n-1 variables, the value of the unknown variable can be found, or by fixing the values of some variables, the relationship between the unfixed ones can be studied.
 
The result is obtained by laying a straightedge across the known values on the scales and reading the unknown value from where it crosses the scale for that variable.
 
The virtual or drawn line created by the straightedge is called an ''index line'' or ''isopleth''.
 
Other types of graphical calculators such as intercept charts, trilinear diagrams and hexagonal charts are sometimes called nomograms.


== In the News ==
== In the News ==
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== Nonfiction cross-reference ==
== Nonfiction cross-reference ==


* [[Nomogram]]
* [[Nomogram (nonfiction)]] - a two-dimensional diagram designed to allow the approximate graphical computation of a [[mathematical function (nonfiction)]].


External links:
External links:

Revision as of 15:56, 21 August 2016

File:Parallel Scale Nomogram.svg
A parallel-scale nomogram.

A nomogram (from Greek νόμος nomos, "law" and γραμμή grammē, "line"), also called a nomograph, alignment chart or abaque, is a two-dimensional diagram the which uses the Gnomon algorithm to convert the graphical computation of a mathematical function (nonfiction) into force.

In the News

Fiction cross-reference

Nonfiction cross-reference

External links:

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