They work by sending out pulses of high-frequency sound and then interpreting the reflections as images.To do all this, though, you need a device called a transducer.

They work by sending out pulses of high-frequency sound and then interpreting the reflections as images. To do all this, though, you need a device called a transducer.

She continued in very agitating reflections till the sound of Lady Catherine '; s carriage made her feel how unequal she was to encounter Charlotte '; s observation, and hurried her away to her room.