William Henry and William Lawrence Bragg Invented X Ray Crystallography.

X Ray Crystallography was invented in 1912

X-ray crystallography is a technique used for determining the atomic and molecular structure of a crystal, in which the crystalline atoms cause a beam of incident X-rays to diffract into many specific directions.

It is the use of X–ray diffraction to determine the structure of crystals or molecules, such as nucleic acids.

William Henry and William Lawrence Bragg Invented Crystallography at the University of Leeds and University of Cambridge. The father-and-son team were awarded the Nobel Prize in Physics in 1915 for their discovery. X-rays had been discovered by Wilhelm Rontgen a few years earlier on November 8th 1895.