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RELATIONS BETWEEN TWO VARIABLES
Superimposed Cartesian Abacs for Three Variables
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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