They are centimeters. yes they are cm but they can also refer to the points for eg 2inches the lines could refer 2.1 2.2 2.3 and so on
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The "tiny lines" that make up an inch on a ruler are centimeters.
It depends: 8, 10, 16, 32 and, in precision rulers, 64.
On a typical inch ruler the smallest lines are 1/16th dimensions. The next biggest are 1/8th", then 1/4", and finally 1/2".
Five eighths of an inch on a ruler would be located between the half-inch mark and the three-quarter inch mark.
They denote different fractions of the inch. A good engineers ruler will have 64 ths, 32 nds 16 ths and 8 ths at least.