.Draw a line AB=1 unit
Draw a perpendicularBC on B.
Draw an arch of radius=AC on A cutting line AC extended
Mark the point as E where the arch cuts the line.That will be root 2
Draw a perpendicularEF on E.
Draw an arch of radius = AF on A cutting line.
Mark the point as F where it cuts the .That will be root 3.
Continue until you reach root 23