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Chapter Ten - List of Common Slide Rule Scales 65to cot(84.3) is read on the C scale. You may need to flip your rule over toread the CI scale.The second arrangement is known as a “double scale” whereby the angleis set above the line if it is between 5.7 and 45 degrees, and below theline if it is between 45 and 84.3 degrees. Tangents are then read on theC or D scale, and cotangents read on the CI scale.LL0, LL1, LL2, LL3 Scale (value relative to C/D = e x ). Log Log scales.Exponential power scales used for raising a number to any power orextracting any root that is greater than one.LL00, LL01, LL02, LL03 or LL/0, LL/1, LL/2, LL/3 Scale (value relative to C/D = e -x ). Reciprocal Log Log scales. Exponential power scales used forraising a number to any power or extracting any root that is less thanone.