Sunday Stamps - Discoveries/Inventions: Denmark

 You may argue that the atomic theory developed by Niels Bohr is not strictly a discovery or an invention. However ts importance cannot be denied.

Denmark issued commemorative stamps for the 50th anniversary of his theory which has stood the test of time.

Denmark - 21 November 1963

It was in the 1950s when I first became aware of his work when studying atomic physics as part of my degree course at St Andrews University.

For more theories, discoveries and inventions check out the links at The Fathers of Invention

Sunday Stamps - science: Denmark, West Germany

As part of my degree course at St Andrews University in the 1950s I had to study Atomic Physics for a term. That's where I first heard of Niels Bohr's Atomic theory.

Denmark - 21 Nov !963

In 1813 Bohr had proposed a theory for the hydrogen atom based on quantum theory that energy is transferred only in well defined quantities. Electrons move round the nucleus in prescribed orbits and when they jump from one orbit to another with lower energy a light quantum is emitted.

These stamps were issued to commemorate the 50th anniversary of his theory. His atomic model depicts a positive charged nucleus surrounded by electrons travelling in circular orbits defined by their energy level.

By the time of this anniversary we had seen the first Russian space flight (1961). Equipment used to track this event had included radio  telescopes.

This one appeared on a German stamp.

West Germany - 15 July 1975

For more science related stamps follow the links at Sunday Stamps - lunar