“…We have adapted to this work magnetrons such as described by Kilgore 4 and also negative grid tubes such as described by SamueLs In the latter case use has been made of both the fundamental and the harmonic power. We have adapted to this work magnetrons such as described by Kilgore 4 and also negative grid tubes such as described by SamueLs In the latter case use has been made of both the fundamental and the harmonic power.…”