Home-made Electrical Apparatus

Only those who are so fortunate as to live in a house wired for light and power service and supplied from the street mains, are likely to be able to utilize the first named. Tho...

*Static Electricity* is an extremely interesting subject for the amateur experimenter, in view of the many spectacular experiments which may be performed with it. The number of...

A Spark Coil is one of the most interesting pieces of apparatus that an experimenter can possess. Not only can it be used to transmit wireless messages, but numerous and various...

Liquid which will conduct a current of electricity is called an *electrolyte*. All electrolytes are compounds, that is, they consist of more than one substance. When an electric...

FIG. 1.—A simple Wimshurst Machine which any boy can easily make. P P, Plates; BR, Neutralizes; C R, Collectors; DR, Discharge Rods; J J, Leyden Jars; H H, Insulating Handles; C...

An Electric engine is really a form of electric motor but differs from the most common form of the latter in that the armature, instead of revolving, oscillates back and forth,...

1. A battery which produces the electric current. 2. A wire to conduct the current from one point to another. 3. A key or switch for turning the current off and on. 4. An electr...

Many of the readers of this book are probably "wireless experimenters" who have constructed their own wireless telegraph apparatus, but not many have ever built a wireless telep...

Medical coils and "shocking coils" are the same. The term "shocking coil" is usually applied to the low priced medical coils which most boys are familiar with for giving "shocks".

Not many years ago, the telephone was the wonder of the times just as the aeroplane and the wireless are to-day. The original telephone apparatus was an exceedingly crude and si...

The tungsten lamp uses less than one third the amount of current required by the old-fashioned carbon filament lamps in producing the same candle power. This means that the batt...

If several turns of wire are wrapped about a compass, and a current of electricity sent through the coil, the compass needle will be deflected. Such an instrument is called a *g...

The switch shown in Figure 76 is a very simple device which will be found very handy for many purposes. It consists of two brass levers mounted alongside of each other and conne...

It is very difficult to construct a first class dynamo without resort to the materials and methods employed in the manufacture of commercial machines. The necessity for careful...

A Step-Down Transformer will reduce the 110 volt alternating current to a low voltage. These low voltage currents are still alternating but will operate almost all sorts of dire...

MANY experimenters desire some device by which wireless signals may be made clearly audible without the necessity of holding a telephone receiver to the ear. It is not possible...

The field frame and armature of the motor shown in Figure 133 are laminated, that is, built up of separate sheets of iron. They may be made out of sheet tin or ordinary stove pi...

Oftentimes the only source of electrical energy for experimental work is the 110 volt alternating current supply. This may be reduced to a voltage suitable for operating small b...

IF the discharge from a Leyden jar or a condenser is passed through a coil of wire acting as a primary and the primary is provided with a secondary coil of a larger number of tu...

1.—Magnetism. 2.—Magnetic Induction. 3.—Primary and Secondary Cells. 4.—Electric Currents. 5.—Electromagnetism. 6.—Dynamo-Electric Machinery. 7.—The Induction Coil. 8.—The Trans...

It is often desirable to operate experimental apparatus and other electrical devices from the 110 volt lighting circuit. Such a circuit may be either direct or alternating, comm...

We have received so many requests from our customers for information as to where they may obtain some of the materials required to build the apparatus described in this book, th...

The Book you are now reading is only the first volume of "Home-made Electrical Apparatus." Written in a very clear and simple style, the other volumes are invaluable to the youn...

Experiment 1—An Imitation Gassiot’s Cascade. .................... Experiment 2—A Ghostly Light .................................... Experiment 3—Lighting Geissler Tubes. ..........

CONDENSER*. The base; the primary; the secondary; the pillar; the switch; How to make the Simplex cat whisker detector; How to make the Simplex fixed condenser; How to connect t...

How to Make a Pole Changing Switch or Current Reverses How to Reverse a Small Motor. .......................................... How to Make a Small Battery Rheostat for Regulati...