Please answer this: This article: The two main requirements of an anti-torque system are that it should prevent rotation of the sonde, and it should allow easy movement of the drill up and down the borehole.  Attempts have been made to design drills with counter-rotating components so that overall torque is minimized, but these have had limited success.  Five kinds of anti-torque systems have been devised for use with cable-suspended EM drills, though not all are in current use, and some drills have used a combination of more than one design.  The first drill to require an anti-torque system was used at Camp Century by CRREL in 1966; the drill incorporated a set of hinged friction blades that swung out from the sonde when the drill motor was started.  These were found to have very weak friction against the borehole wall, and were ineffective; the drill had to be controlled carefully to prevent twisting the cable.  No other drills have attempted to use this approach.For the next deployment of the drill leaf springs were installed, and this has proved to be a more durable design.  These are mounted vertically, with a curve outwards so that they are easily compressed by the borehole wall, and can slide up and down with the movement of the drill.  They pass easily through any areas of irregularity in the borehole, but the edges of the springs cut into the borehole wall and prevent rotation.  Leaf springs are very simple mechanically, with the additional benefit of being easy to adjust by changing the spacing between the end points.  They can be placed anywhere on the drill that does not rotate, so they do not add length to the sonde.  The shape is usually a fourth-order parabola, since this has been determined to provide the most even loading against the borehole wall.  Leaf springs have been found to be so effective that they can prevent rotation even in heavy drills running at full power.Skate antitorque systems have blades attached to vertical bars which are pushed against the borehole wall; the blades dig into the wall and provide the... contains an answer for the question: What acts as reamers when they fail?, what is it ?
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Answer: skates


Please answer this: This article: The Catacombs of Rome contain most of the surviving Christian art of the Early Christian period, mainly in the form of frescos and sculpted sarcophagi. They show a Christian iconography emerging, initially from Roman popular decorative art, but later borrowing from official imperial and pagan motifs.  Initially, Christians avoided iconic images of religious figures, and sarcophagi were decorated with ornaments, Christian symbols like the Chi Rho monogram and, later, narrative religious scenes. The Early Christians' habit, after the end of their persecution, of building churches (most famously St Peter's, Rome) over the burial places of martyrs who had originally been buried discreetly or in a mass grave perhaps led to the most distinctive feature of Christian funerary art, the church monument, or tomb inside a church. The beliefs of many cultures, including Judaism and Hinduism as well as classical paganism, consider the dead ritually impure and avoid mixing temples and cemeteries (though see above for Moche, and below for Islamic culture). contains an answer for the question: What show a Christian iconography emerging, initially from Roman popular decorative art, but later borrowing from official imperial and pagan motifs?, what is it ?
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Answer: Christian art of the Early Christian period


Please answer this: This article: Bernard Chanticleer, called "Big Boy" by his parents, is 19 but still lives with his overbearing, clinging mother and his commanding, disapproving father, who is Curator of Incunabula at the New York Public Library. Bernard also works as a low-level assistant at the library, where his father is constantly monitoring and admonishing him. His father decides it's time he grew up and moved out of the family home in Great Neck and into his own Manhattan apartment. His mother is not happy about letting him go, but acquiesces to her husband and arranges for Bernard to live in a rooming house run by nosy, prudish Miss Nora Thing.  Miss Thing inherited the building on the condition that her late brother's aggressive pet rooster be allowed to occupy the fifth floor, which Bernard must pass to get to his room. Miss Thing reassures Bernard's mother that the rooster only attacks girls, especially young pretty girls, to which Bernard's mother responds that her son isn't interested in girls yet, but arranges that Miss Thing will spy on Bernard and report any "female" activity. Bernard's mother also constantly mails locks of her hair to Bernard at his new residence. contains an answer for the question: Who is said to not like girls?, what is it ?
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Answer:
Bernard Chanticleer