References in periodicals archive ?
Pentode applied the mathematics of Black Holes in the Universe, and showed that a singularity, a region of infinite curvature in space time, laid in our distant past....the point from which came the Big Bang!
External view of individual elements of the modern electrovacuum pentode (from left to right: filament, heated cathode, three metal grids, anode, at the top of the mentioned EL elements--details of their attachment) [7]