Technology
There is no study so profound as electricity. It is a marvel to the scientist as well as to the novice. It is simple in its manifestations, but most complex in its organization and in its ramifications. It has been shown that light, heat, magnetism and electricity are the same...
The camera sees things invisible to the human eye. Its most effective work is done with beams which are beyond human perception. The photographer uses the _Actinic_ rays. Ordina...
4. Chapter 4THREE ELECTRICAL SOURCES.--It has been found that there are three kinds of electricity, or, to be more accurate, there are three ways to generate it. These will now be described.
15. Chapter 15DIRECT CURRENT.--When a current of electricity is generated by a cell, it is assumed to move along the wire in one direction, in a steady, continuous flow, and is called a _dire...
16. Chapter 16The most important step in the electric field, after the dynamo had been brought to a fairly workable condition, was its utilization to make light. It was long known prior to th...
7. Chapter 7SIMPLE SWITCHES.--We have now gone over the simpler or elementary outlines of electrical phenomena, and we may commence to do some of the practical work in the art. We need cert...
12. Chapter 12VIBRATIONS.--Every manifestation in nature is by way of vibration. The beating of the heart, the action of the legs in walking, the winking of the eyelid; the impulses from the...
13. Chapter 13DECOMPOSING LIQUIDS.--During the earlier experiments in the field of electricity, after the battery or cell was discovered, it was noted that when a current was formed in the ce...
5. Chapter 5MEASURING INSTRUMENTS.--The production of an electric current would not be of much value unless we had some way by which we might detect and measure it. The pound weight, the fo...
3. Chapter 3PERMANENT MAGNETS.--A permanent magnet is a piece of steel in which an electric force is exerted at all times. An electro-magnet is a piece of iron which is magnetized by a wind...
17. Chapter 17It would be difficult to mention any direction in human activity where electricity does not serve as an agent in some form or manner. Man has learned that the Creator gave this...
14. Chapter 14GENERATING HEAT IN A WIRE.--When a current of electricity passes through a conductor, like a wire, more or less heat is developed in the conductor. This heat may be so small tha...
9. Chapter 9MECHANISM IN TELEGRAPH CIRCUITS.--A telegraph circuit requires three pieces of mechanism at each station, namely, a key used by the sender, a sounder for the receiver, and a bat...
2. Chapter 2PREPARING THE WORKSHOP.--Before commencing actual experiments we should prepare the workshop and tools. Since we are going into this work as pioneers, we shall have to be depend...
8. Chapter 8STORING UP ELECTRICITY.--In the foregoing chapters we have seen that, originally, electricity was confined in a bottle, called the Leyden jar, from which it was wholly discharge...
1. Chapter 1There is no study so profound as electricity. It is a marvel to the scientist as well as to the novice. It is simple in its manifestations, but most complex in its organization...
10. Chapter 10INDUCTION.--One of the most remarkable things in electricity is the action of induction--that property of an electric current which enables it to pass from one conductor to anot...
11. Chapter 11TELEGRAPHING WITHOUT WIRES.--Wireless telegraphy is an outgrowth of the ordinary telegraph system. When Maxwell, and, later on, Hertz, discovered that electricity, magnetism, an...
6. Chapter 6UNDERSTANDING TERMS.--We must now try to ascertain the meaning of some of the terms so frequently used in connection with electricity. If you intended to sell or measure produce...