"T"
Scales 

T<45° T>45° T<45°' T>45°' 
The T<45° scale, also known as the
T scale on some rules, runs from angle degrees from 5.7° to
45°. The T<45° and T>45° scales
are normally associated with the C or D scale, depending on
whether these scales are on the rule or the slide. The
T>45° scale ranges from 45° to approximately
84.5°. The tangent or cotangent may be read from the C
or D scale. The T>45°' and T<45°' scales have
the scale ticks on the top side of the scale, while the
T>45° and T<45° scales have the scale ticks on the
bottom of the scale. These scales were labeled T1 and
T2 in earlier versions of iSlideRule. Formula: T = tan X or cot X 
T_{2} 
The T_{2} scale is a folded at 360
fundamental scale, normally found on the slide. This
scale is used in financial calculations involving compound
interest over time. Gauge marks are located at ⑫ (dozen), Ⓖ (gross), π, and τ. Formula: T_{2} = 360 × X 
Th 
The Th scale is a scale of hyperbolic
tangents, and along with the Sh_{n} scales
can be used in electrical engineering calculations.
This scale ranges from 1 to 3. Formula: Th = tanh X 
θ  The θ scale shows values in degrees
and is used to convert between degree values on this scale,
and the radians equivalent shown on the X scale. 