Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of the air are rarefied. To reach a number of miles out into space requires the overcoming of difficulties of a merely mechanical nature.

A point of great importance would be first to know: what is the capacity of the earth? And what charge does it contain if electrified? Though we have no positi…

Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe. This idea is not novel. Men have been led to it lon…

As a son of my homeland I feel it is my duty to help the city of Zagreb in every respect with my advice and work.