A nomogram, nomograph, or abac is a graphical calculating device, a two-dimensional diagram designed to allow the approximate graphical computation of a function.
A nomogram typically has three scales: two scales represent known values and one scale is the scale where the result is read off. The known scales are placed on the outside; i.e. the result scale is in the center. Each known value of the calculation is marked on the outer scales and a line is drawn between each mark. Where the line and the inside scale intersects is the result. The scale marks include 'tick marks' to indicate exact number locations, and labeled reference values. These scales may be linear, logarithmic or have some more complex relationship. Straight scales are useful for relatively simple calculations, but for more complex calculations, simple or elaborate curved scales may need to be used.
Usage is simple — a taut string or other straight edge is placed so as to contact the two known values on their lines. The required answer is read off another line. This allows calculation of one variable when the other two are known. Additional lines are sometimes added that are simple conversions of one of the other variables.
This category has the following 2 subcategories, out of 2 total.
Media in category "Nomograms"
The following 15 files are in this category, out of 15 total.
- Chisquarenomo3.png 451 × 661; 76 KB
- Components of a Nomogram.png 954 × 1,053; 100 KB
- Lalanne-calculator-chart-thumbnail.jpg 981 × 1,210; 1.86 MB
- Larson.jpg 1,824 × 2,016; 325 KB
- Nomogramm zum scheinbaren Einfallen nach Palmer.pdf 1,170 × 1,631; 165 KB
- NomogrammeClarkCercle.svg 610 × 570; 236 KB
- NomogrammeClarkFolium.svg 983 × 484; 172 KB
- NomogrammeMobius.svg 845 × 546; 108 KB
- NomogrammeMobiusAction.svg 845 × 546; 108 KB
- NomogrammeOcagne1.svg 657 × 837; 129 KB
- Nomogramparallelresistance.png 706 × 719; 23 KB
- Nomogramparallelresistance.svg 700 × 700; 47 KB
- Parallel Scale Nomogram.svg 400 × 355; 38 KB
- ParallelScaleNomogram.pdf 653 × 736; 81 KB
- ParallelScaleNomogram.svg 312 × 353; 38 KB