a logarithmic line, usually graduated upon scales, sectors, and the like. It is also called the line of lines and line of numbers; being only the logarithms graduated upon a ruler, which therefore serves to solve problems instrumentally in the same manner as logarithms do arithmetically. It is usually divided into 100 parts, every tenth of which is numbered, beginning with 1 and ending with 10; so that if the first great division, marked 1, stand for one tenth of any integer, the next division, marked two, will stand for two tenths, 3 for three tenths, and so on; and the intermediate divisions will in like manner represent hundredth parts of the same integer. If each of the great divisions represent 10 integers, then will the lesser divisions stand for integers; and if the greater divisions be supposed to be each 100, the subdivisions will be each 10.

Use of Gunter's Line. 1. To find the product of two numbers. From 1 extend the compasses to the multiplier; and the same extent, applied the same way from the multiplicand, will reach to the product. Thus if the product of 4 and 8 be required, extend the compasses from 1 to 4, and that extent laid from 8, the same will reach to 32,