Reed length of the textile craft on reed sheet is it?

Update:16-01-2018
Summary:

Why two values? How to calculate? Reed length of textil […]

Why two values? How to calculate?
Reed length of textile craft alone does not mean reed width, reed length is the length of the reed, reed length reed width equal (including the waste edge) or up to 15mm and then wide, of course, if the weaving cloth species Has been used to the maximum reed width can no longer have a larger size, so reserved for the 15mm to be moved to the right.
Reeds are measured, not calculated.
Reed width refers to the warp according to a certain number of reeds into the reed into the width obtained after the reed on the reed from the first yarn to the last yarn measured width.
Reed number has two values, divided into metric reed number and English reed number, metric reed number refers to the number of dent within 10cm; English reed number refers to the number of dent within 2 inches.