Understanding diffraction and dispersion is key to optical science, influencing technologies like spectroscopy, fiber optics, ...

IN two recent notes 1, we reported that ultrasonic waves of frequencies as high as 100 Mc./sec. were generated. The diffraction patterns produced by such waves were found to exhibit interesting ...

USING a specially constructed rectifier giving 1,100 volts and a Taylor T 55 valve with amphenol bases and special inductances, frequencies up to 100 megacycles per second have been produced. A ...