To pace or mark off(something read aloud or spoken) by pauses.
All clocks must have a regular, constant or repetitive process or action to mark off equal increments of time.
Then, use a simple system of symbols to mark off 4 different information types in the column space left in the margin.
As you climb the stairs, you mark off the length of the barometer along the wall. You then count the number of marks, and this will give you the height of the building in barometer units.
The spectrum of vertical rectangular-cylinder put up periodic zero counters which mark off quadrate areas,the values of counter in each areas alternately change between the plus and the minus,and with the increasing of wave number,the values of counter present attenuation character alike e exponent.
