IN order to make a high-frequency oscillator for brass plates, I wound a suitable inductance around a nickel rod twelve inches long and one eighth of an inch in diameter. The inductance was excited at ...

They’re a cool and easy way to demonstrate certain waves, with a bit of cleanup afterward. This week, we’re serving up some sound science on a “Chladni plate.” * Ernst Chladni was a very important ...

THE Chladni plates in use at the present time for producing nodal lines are ordinarily made of brass, ten inches square (or ten inches in diameter if circular) and one eighth or one sixteenth of an ...