Electromagnetism, gravitation and Mach's principle

In the article, it is shown that in a consistent relational approach to physical reality gravitational interactions are of a secondary nature derivable from electromagnetism. This conclusion is in agreement with a number of the ideas proposed by the classics of fundamental physics early in the 20th century in the spirit of Mach’s principle.Keywords : Relational approach to physical reality, action-at-a-distance concept, Mach’s principle, electromagnetism, gravitation, theory of reference frames, elementary particle masses.