iSlideRule Scales - S
"S" Scales
S
The S scale is a scale of sines and cosines, running from 5.7° to 90°.  Select the degrees on this scale and read the sine or cosine on the C/D.  The magnitude on the C/D scale will be from 0.1 to 1.0.

Formula: S = sin X
Sh1
Sh2

The Sh1 and Sh2 scales are used in electrical engineering calculations, and calculate the hyperbolic sine function.  Sh1 ranges from 0.1 to 0.89, while Sh2 ranges from 0.89 to 3.0.  These scales are available for use on the top or bottom rules.

Formula: Shn = sinh X
SRT
The SRT scale (formerly ST scale) extends the S scale for smaller angles between 0.56° and 5.8°.  The values on this scale range from 0.01 to 0.1 read from the D scale.  In this range, sines and tangents are nearly equal so this scale can be used for both.

Formula: SRT = sin, tan X
Smann
The Smann scale in iSlideRule is another representation of the SRT scale, for small angles.  This scale ranges from 0.57° to 5.7°.

Formula: Smann = sin, tan X

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