Märgistusnöör võimaldab tekitada sirgeid jooni pingul nööri abil, mis on eelnevalt kaetud lahtise pulbrilise värvainega – tavaliselt kriidiga. Nöör asetatakse märgistatavale pinnale ja tõmmatakse pingule ning seejärel nööri tõmmatakse ja lastakse sel järsult vastu pinda lüüa; löögi tagajärjel kandub nööril olev kriit pinnale, moodustades sirge joone.
A chalk line creates straight lines by the action of a taut string that has been previously coated with a loose, powdered dye, usually chalk. The string is then laid across the surface to be marked and pulled tight. Next, the string is plucked or snapped sharply, causing it to strike the surface, which then transfers its chalk to the surface along the straight line where it struck.
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