would a compass work in the underground?
927344
I use one underground regularly.  The magnetic field pervades the whole planet.  Magnetic objects or rocks can distort the measurements, but they can at the surface too.\n\nEven if you were so deep underground that your compass was above the Curie Point and lost it's magnetism (in which case you would be dead as that is over 500 degrees), you could still use a fireproof electronic flux-gate compass, as the magnetic field is generated by the molten iron core (nobody is exactly sure how), so the field is present at all temperatures.
828817
I like the Suunto compass.  The KB-14 series compasses have a unique sighting arrangement so that you can shoot a bearing to better than half a degree -- far more accurately than any other compass I have ever seen.  But they are expensive -- they run about $100.
528890
depends on your perspective doesn't it.\n\nbut by definition, "down" is in the direction of gravity.\n\nit is impossible to dig "up" unless you were underground.
28860
You're asking about divining.\n\nWhen divining is tested using anything even remotely resembling a scientific test, it fails.  You can't find underwater pipes (tile in your question) or any other form of underground water that way.\n\nYou might resubmit your question to a group that covers perpetual motion, ghosts, or alien abductions.  You might get an explanation from them.
1122646
NO!  Normally yes, but right up near the MAGNETIC north OR the magnetic South, it varies.\n\nIf you are between the true north and the magnetic North, the end of the other needle can spin or point to the true North.
886944
Looks like it may be E) if it's something you can put under STM and use tunneling effect to make some measurements.
250947
maybe using a magnet will help
609714
Take a compass and a bar magnet and let them trace the field lines. Or better yet, take a piece of paper with metal shaving on it, then place a magnet underneath. The shaving will align with the field lines. Pretty cool.
339392
Websters dictionary says a transit is an instrument used by surveyors to determine angles. It also measures the up and down layout of the ground called topography. I believe you need 2 people, one to move a measuring stick and the other one reads the transit. Surveyors put the transit in a fixed or assigned spot. He looks through a little telescope that has a movable measure on the side called a compass (Maybe you will remember a similar tool from school called a protractor). The protractor measures distances and makes circles. The compass on the side of transit measures angles. By looking and recording the different angles and degrees on the transit compass compared to the assigned mark on the measuring stick the surveyor records the surface of the ground. In this way the surveyor provides information to the contract engineer. The measurements are used in algebra formulas to determine how much additional dirt is needed to make to site level or if the ground needs to be scrapped off to make it level. or the info could be used to determine if the site possibly will flood. I hope this is the info you are looking for. An encyclopedia or science book can probably do a better job of describing the process than I have. I hope you get a lot more responses.
1091983
If we tell you they wouldnt be underground now would they?
699104
Compass needles align themselves with the magnetic field directions. On earth, the magnetic field direction is always from the north pole to the south pole (approximately), hence the compass shows north and south directions.\n\nThus, if in a particular location in space there is a magnetic field, the compass will align itself with it, otherwise, if there is no magnetic field around (most likely in your assumption of space) the needle will not try to show any direction, as you turn the compass, the neddle will freely turn with it.
1008746
a needle magnet otherwise known as magnetic needle, usually helps one to detect directions. it is just the magnetic compass we often use when one treks out...!
1028903
how about a gyroscope?
940573
Yes, but they won't be able to answer as I don't think computers have reached there yet!\n\nBelow is a link to the nearest place with a computer..\nSnodland.
140681
well i really don't recall the actuall machine that does it, but basically you need to make a 3d map of the underground arround your house. Using a hyped version of an ultrasound there is a machine that lets you "see" the underground by interpretting the density of the object below so an object thats more dense than the ground (a wall of a secret room, a skull, a bag of golden coins) would be spottable
982565
It can't be done with an unmarked straightedge and a compass, but it can be done with a *marked* straightedge and a compass. The latter was doen by Archimedes about 200BC.
985719
Have you tried looking under a rock?