The principle used in most encoders (linear or rotational) is the same: an optical device. We shall study two types of rotational encoders briefly. Figure 3.12 shows an incremental encoder.
Amy McDougall/Barone (Monica Horan) becomes Robert Barone's second wife (in season 7), and is the best friend of Debra, who introduces her to Robert. A recurring character for the first seven seasons of the series, Amy became essentially a regular cast member for the remainder of the show's run.
Amy Lawrence. Amy is Becky Thatcher's rival for most of The Adventures of Tom Sawyer, and dislikes Becky. Amy is Tom's first love, but is swept from his thoughts the moment he sees Becky. After a little slip-up from Tom, he returns to Amy to make Becky jealous.