PREFACE
Although text-books of science may appear to the general reader to be "very dry" material, there is no doubt that, when scientific facts and theories are put into everyday language, the general reader is genuinely interested. The reception accorded to the present author's Scientific Ideas of To-day bears out this fact. While that volume explains, in non-technical language, the latest scientific theories, it aims at giving a fairly full account, which, of course, necessitates going into a great deal of detail. That the book has been appreciated by very varied classes of readers is evident from the large numbers of appreciative letters received from different quarters. But the author believes that if the story of modern science were told in a still more popular style, it would serve a further useful purpose. For there are readers who do not care to go into details, and yet would like to take an intelligent interest in the scientific progress of the present day. Some of those readers do not wish to trouble about names and dates, while the mere mention of rates of vibration and such-like is a worry to them. They wish a book which they may read with the same ease as an interesting novel. Hence the form of the present volume.
The author is indebted to Professor James Muir, M.A., D.Sc., of the Glasgow and West of Scotland Technical College, and to H. Stanley Allen, M.A., D.Sc., Senior Lecturer in Physics at King's College, University of London, for very kindly reading the proof-sheets. The author is indebted further to Professor Muir in connection with some of the illustrations, and for others to Dixon and Corbitt and R. S. Newall, Ltd., Glasgow; Siemens Schuckert Werke, Berlin.
CONTENTS
- PAGE
- [CHAPTER I]
WHAT THE STORY IS ABOUT - The Scribe introduces the Electron to the reader. He has something to say also about the mysterious æther which pervades all space. He emphasises the fact that the electron is a real existing thing [21]
- [CHAPTER II]
THE ELECTRON'S PREFACE - The Electron explains the reason why it has written its autobiography [29]
- [CHAPTER III]
THE NEW ARRIVAL - The Electron points out who the new arrival is really. It relates an amusing experience. It tells how man disturbed electrons before he discovered their existence. An ancient experiment, and what the wise men of the East thought about it. How electrons are responsible for the electrification of any object. Handled by a new experimenter, they surprise man. Man becomes of special interest to the electrons [32]
- [CHAPTER IV]
SOME GOOD SPORT - The Electron explains how man succeeded in crowding them together, with some rather exciting results from the overcrowding. One historical incident. Man's fear of the consequences. How a party of electrons wrecked a church steeple. An unfortunate accident [42]
- [CHAPTER V]
MY EARLIEST RECOLLECTIONS - The Electron's story begins at a very far distant period, before this world had taken shape. The Electron was present when the atoms of matter were being formed. The birth of the moon. Something still to be discovered. The moulding of the planet. Boiling oceans. The electrons took an active part in making sea-water salt. The Electron explains why it has been chosen to write the story of itself and its fellows [52]
- [CHAPTER VI]
MAN PAYS US SOME ATTENTION - The electrons are encouraged by one of the experiments made by man. They hope it may lead to their discovery, so that their services may be recognised. The Electron's experience in a vacuum tube. A disappointment and a revival of hope. A great declaration by one individual man. The Electron misjudges man. Mention of a great discovery. The christening of the electrons [60]
- [CHAPTER VII]
A STEADY MARCH - The Electron explains how they produce the electric current. How man discovered means of making the electrons march. A simple explanation of how a complete electric circuit is always necessary. How an "earth circuit" works. How the marching electrons can do work [68]
- [CHAPTER VIII]
A USEFUL DANCE - A perpetual dance. A responsible position. How the safety of the mariner depends upon the electrons' dance. How electrons produce a magnet. A convenient kind of magnet, which gains and loses its attractive power when desired. How a permanent magnet is made. The great service of electrons in modern life [76]
- [CHAPTER IX]
HOW WE CARRY MAN'S NEWS - The method of sending the news. The Electron's personal experience. A series of forced marches. How man controls the electrons. How the electrons reproduce the signals [86]
- [CHAPTER X]
HOW WE COMMUNICATE WITH DISTANT SHIPS - An entirely different means of communication. A surprise to man, but not to the electrons. How the electrons produce waves in the surrounding æther. How these waves disturb distant electrons. The Electron's personal experience. Its description of its actions in a wireless telegraph station [94]
- [CHAPTER XI]
HOW WE REPRODUCE SPEECH - Why it is not correct to speak of the electrons as carriers of speech. The action of electrons in the working of telephones. The Electron's own experience in wireless telephony [106]
- [CHAPTER XII]
OUR HEAVIEST DUTIES - A roving commission. How electrons can move gigantic cars and trains. The action of electrons in dynamos and motors. How the electrons transmit the energy. What makes the motor go [116]
- [CHAPTER XIII]
A BOON TO MAN - A simple explanation of how the electrons produce light. How the Electron provides a connecting link between matter and the æther. How light reaches the earth
- from the sun. How the electrons produce that beautiful luminous effect which man calls an "Aurora." How the earth has become a negatively charged body. How electrons produce radiant heat. The difference between light and heat [126]
- [CHAPTER XIV]
HOW WE PRODUCE COLOUR - What colour is really. How the different colour sensations are stimulated by the electrons. The Electron as a faithful satellite to the atom. How electrons can produce the different æther waves. How the electrons respond to the different waves. The production of artificial light. Co-operation of the electrons. Man's ridiculously wasteful processes. The electrons' secret [136]
- [CHAPTER XV]
WE SEND MESSAGES FROM THE STARS - The kind of messages referred to. How the electrons have informed man of what the stars are made. How man reads the electrons' wireless messages. How it is other electrons that enable man to read the messages. The real explanation of reflection of light. How light is absorbed by some objects. How some substances are transparent. Why objects appear coloured. What makes the lines in the spectra of stars. The spectroscope [144]
- [CHAPTER XVI]
HOW MAN PROVED OUR EXISTENCE - How man reasoned out a plan for detecting the electron. How the electrons altered some lines in the spectrum. The curious manner in which the Electron informed man that certain stars are approaching this planet, while others are receding from it [158]
- [CHAPTER XVII]
MY X-RAY EXPERIENCE - X-rays are an old story to some electrons. The Electron's personal experience. A very sudden stop. How electrons made a fluorescent screen send out light. The electrons assist the surgeon. A curious find. Detecting imitation diamonds. The Electron and the mummy [166]
- [CHAPTER XVIII]
OUR RELATIONSHIP TO THE ATOMS - How the atoms of matter attract one another. What constitutes the temperature of a body. What the atoms are made of. An important thing still to discover about the atom. The elements. How the electrons produce compound substances. The real explanation of chemical changes [178]
- [CHAPTER XIX]
HOW WE MADE THE WORLD TALK - It was nothing new on the part of the electrons. Exaggerated rumours. The electrons and radium. Fast-flying electrons. Atomic explosions [186]
- [CHAPTER XX]
CONCLUSION - The Electron is made to sum up a few of the wonders which it has related, in order to emphasise the great services which electrons render to man [194]
- [APPENDIX] [200]
- [INDEX] [211]