Traditional Slide Rule

For multiplication and division

🏠

A

1.0

B

1.0

Log₁₀ (A)

0.0

Move Hairline:

Move B:

How to Use

Move the hairline to the first number (i.e 2.5) on the A scale
Slide the B scale to align 1 with the hairline
Move the hairline to the second number (i.e 3.2) on the B scale
Read the result on the A scale