ITE Ball Chart

1.    This chart is used for strain measurement of a TV camera's geometric image.

2.    There are 158 double rings which are arranged in 14 rows and 17 columns. The vertical spacing is 1/14h and the horizontal spacing is 2/25h.

The sizes of the double rings are stated as follows:
(1)Outer rings
    Outer circle of the ring Radius:2/100h(2%)
    Inner circle of the ring Radius:1.5/100h(1.5%)
(2)Inner rings
    Outer circle of the ring Radius:1/100h(1%)
    Inner circle of the ring Radius:0.5/100h(0.5%)