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- Seismograph (4037 bytes)
12: ... mass, a motion sensor attached to the mass, an amplifying device, and a recording device.
16: ...ock with an uncracked connection to a continental plate. on small 30cm (1foot) buried concrete piers.
26: A pan of oil is placed on the ground, and a small sheet of metal mou...
34: ... in the magnetic field of a magnetron magnet (cheaply available from microwave oven repair shops). Th... - Copper (13595 bytes)
136: ...ined in [[Cyprus]]). From this, the phrase was simplified to ''cuprum'' and then eventually Anglicized...
138: ...pper [[smelting]], the refining of copper from simple copper oxides such as [[malachite]] or [[azurite...
140: ...h [[tin]] nearly as old. In one pyramid, a copper plumbing system was found that is 5000 years old.
152: ...opper was also the symbol for the planet [[Venus (planet)|Venus]].
155: ...loodstream on a [[plasma protein]] called [[ceruloplasmin]]. When copper is first absorbed in the gut ... - Radar (16746 bytes)
3: ...nals can easily be detected and [[amplification|amplified]].
5: ...trength, detected at even tiny powers, and then amplified many times. Thus radar is suited to detectin...
7: ==Principles==
17: ...not travel well underwater; thus for underwater applications, [[sonar]], based on sound waves, has to ...
20: ...to detect different types of reflections. For example, [[circular polarization]] is used to minimize t...
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