Karl Manne Georg Siegbahn was a Swedish physicist who received the Nobel Prize in Physics in 1924 "for his discoveries and research in the field of X-ray spectroscopy."
Siegbahn in 1924
Title page to The Spectroscopy of X-Rays (1925)
Table of contents to The Spectroscopy of X-Rays (1925)
First page of The Spectroscopy of X-Rays (1925)
Henry Gwyn Jeffreys Moseley was an English physicist, whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic
Manne Siegbahn
…Laboratory hosted by Stockholm University. Siegbahn began his studies of X-ray spectroscopy in 1914. Initially, he used the same type of spectrometer as Henry Moseley had done for finding the relationship between the frequency of characteristic X-rays some elements and their place at the periodic system. Shortly…
A plaque commemorating Moseley's work in the Department of Physics and Astronomy, University of Manchester
Moseley in the Balliol-Trinity Laboratories in 1910
Blue plaque erected by the Royal Society of Chemistry on the Townsend Building of Oxford's Clarendon Laboratory, commemorating Moseley's work on X-rays emitted by elements