The Cornu spiral was created by Marie Alfred Cornu as a nomogram for diffraction computations in science and engineering.

A nomogram consists of a set of n scales, one for each variable in an equation.

A nomogram for a three-variable equation typically has three scales, although there exist nomograms in which two or even all three scales are common.

Nomograms for more than three variables can be constructed by incorporating a grid of scales for two of the variables, or by concatenating individual nomograms of fewer numbers of variables into a compound nomogram.

Lines 8 and 10 are ‘ tie lines ’ or ‘ pivot lines ’ and are used for the transition between the stages of the compound nomogram.

This risk assessment nomogram was developed by the UK Public Analyst Service with funding from the UK Food Standards Agency for use as a tool to guide the appropriate frequency of sampling and analysis of food for official food control purposes, intended to be used to assess all potential problems with all foods, although not yet adopted.

The Smith chart, invented by Phillip H. Smith ( 1905 – 1987 ), is a graphical aid or nomogram designed for electrical and electronics engineers specializing in radio frequency ( RF ) engineering to assist in solving problems with transmission lines and matching circuits.

The nomogram below can be used to perform an approximate computation of some values needed when performing a familiar statistical test, Pearson's chi-squared test.

* Chi-squared test nomogram

The BSA is usually calculated with a mathematical formula or a nomogram, using a patient's weight and height, rather than by direct measurement.

Like a slide rule, a nomogram is a graphical analog computation device, and like the slide rule, its accuracy is limited by the precision with which physical markings can be drawn, reproduced, viewed, and aligned.

The slide rule is intended to be a general-purpose device, while a nomogram is designed to perform a specific calculation, with tables of values effectively built in to the construction of the scales.

An example of this type of nomogram is shown on the right, annotated with terms used to describe the parts of a nomogram.

This nomogram demonstrates the use of curved scales with unevenly-spaced graduations.

For example, the nomogram at the top of this article could be constructed as a parallel-scale nomogram because it can be expressed as such a sum after taking logarithms of both sides of the equation.

A nomogram can be found in the Appendix of Jones, ed.

Alternatively, a nomogram may be used to check an answer obtained from another exact calculation method.

Instead of equations, a nomogram can be used to easily estimate Kt / V from the URR in clinical practice.

Results from a nomogram are obtained very quickly and reliably by simply drawing one or more lines, and the user does not even need to know the actual equation being calculated.

These do not meet the strict definition of a nomogram as a graphical calculator whose solution is found by the use of one or more linear isopleths.

A typical 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 function.

This nomogram is interesting because it performs a useful nonlinear calculation using only straight-line, equally-graduated scales.

The pair of nomograms at the top of the image determine the probability of occurrence and the availability, which are then incorporated into the bottom multistage nomogram.

The sample isopleth shown in red on the nomogram at the top of this article calculates the value of T when S

If the last day ( due date ) for performing any act for tax purposes, such as filing a return or making a tax payment, etc., falls on Saturday, Sunday, or a legal holiday, you may perform that act on the next succeeding day which is not a Saturday, Sunday, or legal holiday.

Our new large-package ring twister for glass fiber yarns is performing well in our customers' mills.

Says Clarence Thompson: `` We dealers must earn our mark-up by performing a service for the builder cheaper than he could do it himself ''.

And after several correspondents went into Pathet Lao territory and exposed the huge build-up, administration spokesmen acclaimed them for performing a `` great service '' and laid the matter before the Southeast Asia Treaty Organization.

Whitey Herzog, performing in right as the Orioles fielded possibly their strongest team of the spring, worked Keegan for a base on balls.

Mr. Bolker heads a group within the building and development industry to raise funds in support of this cultural center for the performing arts.

The abacus ( plural abaci or abacuses ), also called a counting frame, is a calculating tool used primarily in parts of Asia for performing arithmetic processes.

* ATLAS Transformation Language, an OMG standard for performing model transformations

* Protocol analysis – a means for extracting persons ' thoughts while they are performing a task

For cryptographers, a cryptographic " break " is anything faster than a brute force — performing one trial decryption for each key ( see Cryptanalysis ).

In 2008, effective January 1, 2009, the ADAAA broadened the interpretations and added to the ADA examples of " major life activities " including, but not limited to, " caring for oneself, performing manual tasks, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating, and working " as well as the operation of several specified " major bodily functions ".

Police officers and court officials have a general power to use force for the purpose of performing an arrest or generally carrying out their official duties.

* AMPL Solver Library, an open-source library for reading nl files and performing automatic differentiation

Built on top of AppleTalk Session Protocol ( for legacy AFP over DDP ) or the Data Stream Interface ( for AFP over TCP ), it provides services for authenticating users ( extensible to different authentication methods including two-way random-number exchange ) and for performing operations specific to the Macintosh HFS filesystem.

It provided basic services for requesting responses to arbitrary commands and performing out-of-band status queries.

* 1951 – Ethel and Julius Rosenberg are sentenced to death for performing espionage for the Soviet Union.

Torvald enters and tries to retrieve his mail but Nora distracts him by begging him to help her with the dance she has been rehearsing for the costume party, feigning anxiety about performing.

Intended for use in both training and daily activities like walking or performing chores, this simple measuring device may offer a solution for reducing obesity.

Among their duties, are responsibility for appointing clergy to serve local churches as pastor, for performing ordinations, and for safeguarding the doctrine and discipline of the Church.