## Abacs Or Nomograms: An Introduction to Their Theory and Construction Illustrated by Examples from Engineers and Physics |

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### Contents

RELATIONS BETWEEN TWO VARIABLES | 1 |

CARTESIAN ABACS | 24 |

Superimposed Cartesian Abacs for Three Variables | 32 |

Copyright | |

12 other sections not shown

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### Common terms and phrases

abscissa of point abscissa of scale alignment chart analogous angle arrangement auxiliary variable axis Cartesian abac Cartesian coordinates central scale chart with parallel Choice of moduli complete chart compute the values construct curve determine diameter Direction of graduation distance double-alignment chart draw duated equation into standard example F scale fixed value formula four variables function given equation given relation graduated with increasing graphically Hence homographic increasing values upwards independent chart intersection joining the points kilograms line joining line parallel linear scale logarithmic scale merely necessary millimetres moduli.—Scale length N scale necessary to compute nomograms oblique coordinates oblique scale obtained parallel coordinates parallel index lines particular value point marked position radians radius range of variation rev/min scale division scale length scale line scale.—The second chart set of straight set-square index lines shown in Fig spherical cap standard form straight line three variables written