iSTd
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The iSTd scale is a combined scale, only
available on the slide in position 2, or 3, and that
combines four differential trigonometric scales into one
scale. The four scales represented are:
Sd - used for sine trigonometric
calculations with values from 0.0° to 90.0°
Td - used for tangent
trigonometric calculations with values from 60.0° to 0.0°
ISd -
used for inverse sine trigonometric calculations with
values from 1.0 down to 0.0.
ITd - used for inverse tangent trigonometric
calculations with values from 0.0 to 1.76.
These scales work in conjunction with the D scale and the
indexes of that scale to perform more complex differential
sine, tangent, arc-sine and arc-tangent calculations.
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