WHILE visiting our laboratory, R.-G. Busnel of France directed our attention to a brief note by Pasquinelly 1 on making visible the magnetically oriented areas on tape recordings by immersing the tape ...

When you step up to the mic, it's not just amplifying you; it's also picking up sound from the front, back, sides, or from multiple directions at once. This is what's known as a microphone's polar ...