Search results
Results from the WOW.Com Content Network
The needle turns to point at a nearby charged object due to charges induced in the ends of the needle by the external charge, through electrostatic induction.For example, if a positively charged object is brought near, the mobile negative charges in the metal will be attracted to it, and move to the end of the needle nearest the object.
A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.
Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.
Compasses are usually made of metal or plastic, and consist of two "legs" connected by a hinge which can be adjusted to allow changing of the radius of the circle drawn. . Typically one leg has a spike at its end for anchoring, and the other leg holds a drawing tool, such as a pencil, a short length of just pencil lead or sometimes a
The sources of local attraction may be natural or artificial. Natural sources include iron ores or magnetic rocks while as artificial sources consist of steel structures, iron pipes, current carrying conductors. The iron made surveying instruments such as metric chains, ranging rods and arrows should also be kept at a safe distance apart from ...
It combined a compass with a protractor built into the base. His design featured a metal compass capsule containing a magnetic needle with orienting marks mounted into a transparent protractor baseplate with a lubber line (later called a direction of travel indicator). By rotating the capsule to align the needle with the orienting marks, the ...
The original Cricut machine has cutting mats of 150 mm × 300 mm (6 in × 12 in), the larger Cricut Explore allows mats of 300 mm × 300 mm, and 300 mm × 610 mm (12 in × 12 in, and 12 in × 24 in). The largest machine will produce letters from a 13 to 597 mm (0.5 to 23.5 in) high.
Long bone fragments can be shaped, by scraping against an abrasive stone, into such items as arrow and spear points, needles, awls, and fish hooks. Other bone tools include spoons, knives, awls, pins, fish hooks, needles, flakers, hide scrapers and reamers. They made musical rasps, flutes and whistles as well as toys have also been made of bone.