ASTON, Les isotopes, 1923

First edition in french.
Francis William Aston (1877-1945) was a British physicist and chemist who received the Nobel Prize in Chemistry in 1922. He invented the mass spectrograph and was able to demonstrate the existence of isotopes for many non-radioactive elements.
This work presents his research on isotopes, a fundamental concept for chemistry and nuclear physics, and the implications of his discoveries.