Abstract
A high resolution camera was constructed for small angle x‐ray scattering. Measurements with this camera on Dow latex 580G exhibit a number of concentric rings. Each ring is associated with a theoretical maximum of scattered intensity predicted by the spherical x‐ray form factor corrected for packing. The particle diameter is then computed from the position of each ring. Twenty measurements yield a diameter of 2780A with a probable error of less than ±1 percent.