Sir William Henry Bragg OM, KBE, PRS died on this day in 1942. He was a British physicist, chemist, mathematician and active sportsman who uniquely shared a Nobel Prize with his son William 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.
Frits Zernike died on this date in 1966. He was a Dutch physicist and winner of the Nobel prize for physics in 1953 for his invention of the phase contrast microscope, an instrument that permits the study of internal cell structure without the need to stain and thus kill the cells.