Diagram of normal sinus rhythm as seen on ECG. In atrial fibrillation the P waves, which represent depolarization of the top of the heart, are absent.
The wah-wah pedal is based on a simple concept but its effect is far more dramatic. Using a powerful filter to sweep through a broad frequency spectrum, the wah pedal boosts and exaggerates specific tones. Creating sounds that range from thick, flubbery bass to scratchy, stinging treble.
Mechanical anemometers. Some of the simplest anemometers work in exactly this way. They're little more than an electricity generator mounted in a sealed-up metal cylinder with an axle protruding upward from it. On top of the axle, there are several large cups that catch the wind and make the generator spin around.echanical anemometers. Some of the simplest anemometers work in exactly this way. They're little more than an electricity generator mounted in a sealed-up metal cylinder with an axle protruding upward from it. On top of the axle, there are several large cups that catch the wind and make the generator spin around.