Induction Coils, How to Make, Use, and Repair Them. Including Ruhmkorff, Tesla, and Medical Coils, Roentgen Radiography, Etc. Etc.

In commencing a description of the Ruhmkorff coil and its uses, a brief mention of the fundamental laws of induction directly bearing on its action will assist in obtaining an i...

In Chapter XII. we showed how Dr. Hertz caused electric waves to pass through space and become visible by sparks across an air gap in a wire ring situated at a distance from the...

The development of the storage or secondary cell has been one of the most important electrical advances of the century. For purposes of experiment or work, where a large or stea...

In selecting a battery to operate the coil, one is needed which will supply a large steady current for a considerable period. Although the primary circuit is opened and closed r...

The simple form of contact breaker already described is useful up to a certain point, but it has disadvantages. Its rate of vibration is only variable through narrow limits, and...

A condenser is an apparatus whereby a charge of electrical energy may be temporarily stored, the amount of energy it will hold determining its "capacity." The capacity of a cond...

Cleaning the boiler, removing scale, scale preventers, oil in boilers, braces and stays, mud drums and feed pipes, boiler fittings, grate bars and tubes, bridge walls, the slide...

When it is desired to light clusters of gas jets situated in inaccessible places, or a number of them simultaneously, this method finds ready application. It operates in the div...

The luminous effects that can be obtained by means of a Ruhmkorff coil are exceedingly beautiful and instructive. The simplest experiment of this nature is the production of the...

Although the remarkable discovery that it was possible by electrical means to depict an image of an object on a photographic sensitized plate, despite the intervention of solid...

Notwithstanding it requires an intensely high potential to enable the current to jump an air gap of 1 inch, the same potential will produce a luminous discharge through exhauste...

Although the luminous discharges in the exhausted tubes are extremely beautiful, yet the effect is indescribably enhanced when the tubes are rotated. Gassiot's star was the name...

The currents of high frequency used by Tesla in his researches are produced by electrical rather than mechanical means. The alternating current dynamo used by him renders a curr...

If a metal or the salt of a metal be burned in a flame it imparts to the flame a distinctive color; table salt thrown into the fire burns with a yellowish flame, denoting the pr...

In selecting an insulating compound for apparatus designed to be under the influence of high tension currents, a glance at some of the peculiarities of such currents will not be...

Arrangements of Simple Circuits of Coil and Coherer for Receiving and Sending Messages. The Coherer. Carbon Coherer. Coherer without Filings. Aluminum Coherer. Steel Ball Cohere...

Clean, fresh solutions and clean contacts are essential. Keep zincs well amalgamated, remove wires from binding posts, and scrape bright the metal where the wires make connectio...

Construction of Ruhmkorff Coils. Sizes of Wires. Winding of Primary and Secondary. Assembling. Connecting Up. Insulation. Coils in Series. Oil Immersed Coils. "Tesla" Coil. Disr...

laps of Steam Valve. CHAPTER VI.—Valve Setting continued. CHAPTER VII.—Lubrication with diagrams for same. CHAPTER VIII.—Discussion of the Air Pump and its Management. CHAPTER I...

Construction of a Storage Cell. Connecting Up Cells. Charging Storage Batteries. Diagram for Charging from Dynamo Using a Rheostat. Diagram for Charging, using Lamp instead of R...

Construction of Contact Breakers. Various Forms of Simple Contact Breakers. The Mercury Vibrator. Polechanging Vibrator. Wehnelt Interrupter. Dessauer Contact Breaker. Steel Rib...

The Selection of Suitable Batteries. Open Circuit Cells. Closed Circuit Cells. Description of Cells. Formulæ for Solutions for Different Kinds of Batteries. The Grenet Battery....