sentence: For example, adding the distance from 1 to 2 on the lower scale to the distance from 1 to 3 on the upper scale yields a product of 6, which is read off at the lower part.
modified: For example adding the distance from 1 to 2 on the lowest scale to the distance from 1 to 3 on the upper scale yields a product of 6 which is read off at the lowest part