THE SCRIBE'S NOTE ON CHAPTER SIXTEEN
Several men of note declared that "little particles" revolved around the atoms of matter, and that it was the motion of these particles which produced the well-known æther waves of light.
This idea was suggested by the result of certain mathematical calculations.
It was some time before real experimental proof was obtained.
The electron tells its own tale of this great discovery.
When the electron speaks of a spectrum line being shifted up or down the scale, it means towards the violet or the red end respectively.
We may picture the spectrum as analogous to the keyboard of a piano.
In the second part of this chapter, the electron explains how it has enabled man to discover that certain stars are approaching the earth, while others are receding from it.