“Poole’s Rule” of band shortening for 2mm of buckling, (C1-C2)  C1the initial band circumference =2πr1,(r1=radius of the circle described by the band) For 2 mm indentation, the new circumference, C2=2π(r1-2) C1-C2=the amount of band shortening for 2mm of indentation C1-C2,=2πr1-2π(r1-2) = 2πr1-2πr1 + 4π C1-C2, = 4π, about 12mm

Table 2: “Poole’s Rule” of band shortening for 2 mm of buckling, (C1- C2).