Scientific American

Depending upon the principle of air friction and consisting essentially of two metal cups fitting one into the other, but not touching at any point, a speedometer has been developed to a commercial...

Not since those historic flashes from Mars were received, some years ago, which were probably caused by the reflection of sunlight falling on snow-covered surfaces, and which were promptly interpreted...

Mars is again in the public eye. For several weeks past there has been almost no end to the opinions of the leading scientists and radio experts of this and other countries regarding the mysterious...

Mr. Nicolas Tesla, of Now York, has lately repeated in London, at the Royal Institution, the remarkable electrical experiments first shown in this city. The lecturer was received with great enthusiasm...

One of the most astonishing features in the development of modern journalism is the magnitude and successful audacity of the Sunday issues of the great daily papers, and among these there are none...

It can be taken as a fact, which the theory of the action of the eye implies, that for each external impression, that is, for each image produced on the retina, the ends of the visual nerves concerned...

A Coil With a Seven-Foot Spark Gap The great Tesla apparatus of our physical laboratory, at the College of the Immaculate Conception, Montreal, was designed by my predecessor, Father Gendreau, and was...

Can the Free Energy of Space be Utilized? In a few centuries the world’s coal mines will be exhausted. Whence shall we derive the energy to turn the wheels of industry? By harnessing nature, is the...

At the meeting of the American Institute of Electrical Engineers Mr. Tesla employed a machine having 400 poles, which, when run at full speed, enabled him to obtain 20,000 alternations per second. He...

An Autobiographical Sketch I am glad to be accorded this opportunity for two reasons. In the first place I have long since desired to express my great appreciation of the Scientific American and to...