Categories: Alternative conceptions
An example of a scientific concept that would today be considered an alternative conception
"It is absolutely untrue, although it is often asserted, that the world picture of physics contains, or may contain, directly observable magnitudes only. On the contrary, directly observable magnitudes are not found at all in the world picture. It contain symbols only. In fact, the world picture even contains constituents which have only a very indirect significance for the sense world, or no significance at all, such as ether waves, partial vibrations, frames of reference, etc".
Planck, M. (1948/1949). The concept of causality in physics (F. Gaynor, Trans.). In Scientific Autobiography and other papers (pp. 121-150). Philosophical Library.
