Mac. Maps, blankets, rations, compasses for all the walkers.

These spheres are all suspended, but they have magnets horizontally in them that make them all like compasses.

Tell me, does the magnetic virtue of the needles of the compasses of all those ships attract them thither?

Compass correction Like any magnetic device, compasses are affected by nearby ferrous materials, as well as by strong local electromagnetic forces.

In this way, correction tables could be created, which would be consulted when compasses were used when traveling in those locations.

And I think most of us have at least a working knowledge of what it is we've all played with magnets and we've dealt with compasses.

And we had custom espresso cups made that hide a magnet inside, and make those compasses go crazy, always centering on them.

These are these arrays. These spheres are all suspended, but they have magnets horizontally in them that make them all like compasses.

And we had custom espresso cups made that hide a magnet inside, and make those compasses go crazy, always centering on them.

Fluxgate electronic compasses can be calibrated automatically, and can also be programmed with the correct local compass variation so as to indicate the true heading.

Most of these churches were built in the 12th century, indicating a fairly common usage of magnetic compasses in Europe by then.

Using the optical or prism sight, such compasses can be read with extreme accuracy when taking bearings to an object, often to fractions of a degree.

Creagh Osborne, Superintendent of Compasses at the British Admiralty, introduced his Creagh Osborne aircraft compass, which used a mixture of alcohol and distilled water to damp the compass card.

Shortly afterwards the first detailed treatise dealing with the underground use of compasses was published by a German miner Rülein von Calw (1463 1525).

The military forces of a few nations, notably the United States Army, continue to issue field compasses with magnetized compass dials or cards instead of needles.

Solid state compasses Small compasses found in clocks, mobile phones, and other electronic devices are solid state compasses, usually built out of two or three magnetic field sensors that provide data for a microprocessor.

Compasses are particularly difficult to use accurately in or near trucks, cars or other mechanized vehicles even when corrected for deviation by the use of built in magnets or other devices.

From these experiments, he concluded that the Earth was itself magnetic and that this was the reason compasses point north (previously, some believed that it was the pole star (Polaris) or a large magnetic island on the north pole that attracted the compass).