iSlideRule Scales - R
"R" Scales
R1
R2
R1'
R2'
The Rn scales, used with the D scale, can rapidly determine square roots. R1/R1' runs from 1.0 to √10, while R2/R2' runs from √10 to 10.0.  Combined, the Rn scales are like a D scale twice the normal length. The Rn' scales have the scale ticks on the top side of the scale, while the Rn scales have the scale ticks on the bottom of the scale.  R1 and R2 are available for use on the top and bottom rules, in conjunction with the D scale, while R1' and R2' are available for use on the slide in conjunction with the C scale.
 
Gauge marks are located at π on the R1/R1' scales, and τ on the R2/R2' scales.  All scales have gauge marks at √10.

Formula: Rn = √X
R10
R20
R40
The R10/R20/R40 scale (Renard series) is a scale containing the preferred numbers represented by the Renard series.   The series on this scale consist of the 10√10, the 20√10, and the 40√10 series.  This scale is available for use on the top or bottom rule, and is used in conjunction with the D scale.

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