Magazine

Scientific progress during the past three decades has perhaps surpast that of all preceding ages; but we are still in the kindergarten class when we compare what is known with that which is still to...

The extracts which we publish this week from Mr. Tesla's lecture on alternating currents of very high frequency will be found instructive reading. The numerous experiments described are of great...

If the terminals or plates of a condenser be connected with two points of a circuit, the potentials of which are made to rise and fall in rapid succession, the condenser allows the passage, or, more...

The expiration this week of the three Tesla patents covering fundamentally the rotary-field type of electric motor marks the close of the first stage of one of the several epochal developments of the...

The Tesla motor is to be introduced in the coal mines of the State of New York. The management of the Shawmut coal mines has just made a contract with the Westinghouse Electric Company for seven of...

On giving our secretary the title of this paper it was my purpose to treat the subject in a broader light, and to show the progressive steps in a series of experiments which led eventually to the type...

Owing to the crowded condition of our columns this week we are compelled to issue a supplement in order to give our readers a full exposition of this now splendidly complete system. As the alternating...

Mr. Tesla's method of utilizing electrical effects transmitted through earth or air is described in this issue, the description being based on a careful examination of six United States patents issued...

BY EDWARD P. THOMPSON, M. E. One of the most important facts necessary in order to determine the nature of the X-rays is that which will prove their source. In the first place Prof. Röntgen alleges...

KNOBLAUCH. — An investigation of the following phenomenon: The discharge from a Tesla pole charges an insulated metallic plate positively at a certain distance and negatively at a greater distance...