The mathematician Euler pointed out about 130 years ago in his "Letters to a German Princess" that the electrical processes are probably drew by an invisible and imponderable ether.
Also in the works of Robert Mayer, Angelo Secchi, Aurel Anderssohn and Rudolf Mewes, of the late 1800’ s, the idea of an ether appeared.
Some principles in their works contain the following ideas:
1. The world forms a unified mechanism, in which both the sum of the moved and the sum
of all "causes of movement" - ie the sum of all energy remains constant forever.
2. There is no immediate transmission of energy, so also no immediate remote effect, which, although not sensual perceptible, is mediated by the ether.
3. Matter as well as the ether occupy a space. The ether is impenetrable and therefore resists any external impact, in particular, any external pressure; but also practices external
pressure as a reaction to the received pressure. Besides that, she is divisible, movable, indestructible.
4. Due to the impenetrability, the weighable matter competes with the likewise ethereal ether for space, resulting in a mutually exerted manifested pressure. This pressure is the fundamental cause of every movement of matter.
5. The totality of matter and the sum of energy in the universe remain eternally unchanging.
6. The different forms of energy, be it mechanical, thermal, electrical, magnetic or chemical, spring from a single common Source. This is the principle of conservation and the Unity of energy.
7. Causality is what drives all knowledge of Nature, since all experience is based on the belief that between cause and effect an indestructible legality exists.
8. All the available weighable matter and the unweighable (ether) form a coherent whole and
are to be understood as a single mechanism. But the energy contained in this mechanism
can be defined as pressure.
9. Every cause of movement lies outside the moving.
10. The magnetic pressure can therefore be considered as a logical conclusion of the above mentioned physical principles