The fourth harmonic is the one you get from the string vibrating in quarters, at 4 Hz. This note is an octave higher than the second harmonic, and so is also called C. (The eighth harmonic will also play C, as will the sixteenth, and the thirty-second, and all the powers of two up to infinity.)
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Supporters of red-light cameras argue the systems improve safety by deterring dangerous driving at intersections. Florida’s red-light camera law, known as the Mark Wandall Traffic Safety Act, allows local governments to use automated enforcement systems.