Its grooves guide the strings onto the fretboard, giving consistent lateral string placement.
2.
The leaky-wave antenna is created by first bisecting the groove guide horizontally.
3.
Groove guide ( shown in Fig . 5 ) is a low-loss open waveguide for millimeter waves, somewhat similar to the NRD guide : the dielectric central region is replaced by an air region of larger width ( greater than ? 0 / 2 ).
4.
A face cam that implements three outputs for a single rotational input is the stereo phonograph, where a relatively constant lead groove guides the stylus and tone arm unit, acting as either a rocker-type ( tone arm ) or linear ( linear tracking turntable ) follower, and the stylus alone acting as the follower for two orthogonal outputs to representing the audio signals.
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