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Years back, coaches began to realize that the way to beat the Johnny Unitases and Y.A. Tittles was not to try and outscore them, but to devise bold new means to stop them. Thus football tacticians developed the zone defense (see diagram next page), a formation of varying intricacy designed basically to provide blanket coverage deep in the defensive secondary and thus rob the offense of its most lethal weapon: the long bomb...
There are many varieties of zones in the pro game. One of the most effective is the rotating zone, perfected by the Baltimore Colts and shown in the diagram above. In this defense there are four short areas of responsibility and three deep ones. Ideally, the defensive backs will line up in a nondescript formation, then shift quickly to their predesignated areas as soon as the ball is snapped. In other words, the quarterback sees one defensive alignment before the play begins and a totally different one when he drops back to pass...
...MEAN-TIME. Barth continues his radical experiments in form. There are stories within stories within digressions, flights back and forth through time and a complicated diagram of the heroic cycle. There are pauses in mid-text for the narrator to comment impatiently on the unsatisfactory progress of the narrative. Heroes from other Barth novels make cameo appearances, and halfway through Bellerophoniad, Barth presents an autobiographical account of his novelistic career. For the confused reader, he obligingly provides Robert Graves's summary of the details of the Bellerophon myth...
Severed Circle. As a technical procedure, however, vasectomy is simplicity itself. After administering a local anesthetic, the doctor locates the vas deferens, the thin (3-mm. diameter) tube that carries sperm from the testicle to the seminal vesicle, where it is mixed with other components of the semen (see diagram). Once he has found it, he makes a small incision, draws out the vas and severs it, often removing a small section and tying the ends back on each other so that they cannot rejoin. He then repeats the procedure on the other side. The operation, which costs...
...same time increase the rudder's effective steering angle, a group led by Naval Architect Barry Steele, of Britain's National Physical Laboratory, revived an idea once proposed for aircraft wing flaps. They fitted rotating cylinders around the rudder posts of several ship models (see diagram). Equipped with its own small motor, the cylinder can spin in either direction. Thus when the rudder is pushed hard to port (left), for instance, the cylinder is rotated in a clockwise direction. This directs a flow of water against the back of the rudder, smoothing out the turbulence there and making...