The aviation slide rule requires that the numbers on the outside of the bezel match the numbers on the dial. If you match the numbers 10 and 60, the numbers 20 to 40 will be completely out of alignment.
The aviation slide rule requires that the numbers on the outside of the bezel match the numbers on the dial. If you match the numbers 10 and 60, the numbers 20 to 40 will be completely out of alignment.