what is the profession of the first person mentioned?
Physicist, chemist and mathematician
William Henry Bragg
Sir William Henry Bragg (2 July 1862 – 12 March 1942) was an English physicist, chemist, mathematician, and active sportsman 
determination of crystal structure using x ray diffraction X-ray crystallography what is the primary use of the above method? In its first decades of use, this method determined the size of atoms, the lengths and types of chemical bonds, and the atomic-scale differences among various materials, especially minerals and alloys. what are the materials and equipment needed to carry out this method? UNANSWERABLE can an amorphous substance be used to determine the substance's inner structure? UNANSWERABLE what are the examples of substances which can be observed under this method? The method also revealed the structure and function of many biological molecules, including vitamins, drugs, proteins and nucleic acids such as DNA. what are some of its applications of this method? X-ray diffraction has wide and various applications in the chemical, biochemical, physical, material and mineralogical sciences. what is the advantage of using a crystal to observe its inner structure? Crystals offer a much stronger signal due to their periodicity what are the names of the scientists who are involved in the discovery of this crystallography method? William Henry Bragg and Max von Laue
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William Henry Bragg [SEP] Introduction
Sir William Henry Bragg (2 July 1862 – 12 March 1942) was an English physicist, chemist, mathematician, and active sportsman who uniquely shared a Nobel Prize with his son Lawrence Bragg – the 1915 Nobel Prize in Physics: ""for their services in the analysis of crystal structure by means of X-rays"". The mineral Braggite is named after him and his son. He was knighted in 1920.