To construct a simple plotting compass, you will need a small, lightweight magnetic needle, such as a sewing needle, and a piece of cork or Styrofoam. Magnetize the needle by rubbing it against a magnet in one direction several times. Place the magnetized needle through the center of the cork or Styrofoam so that it can spin freely. When the needle comes to rest, it will align itself with the Earth's magnetic field, indicating north and south directions for plotting on a map.
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put lines on the paper dummy
A compass and a straightedge
A compass is used to construct a perfect circle of 360 degrees.
You'll also need a protractor to construct a 220 degree angle which can then be bisected by means of a compass and a straight line to form two 110 degree angles.
A plotting compass is used to detect which direction the North Pole is located. You can stand in any position and it will always point north. +++ That's a navigation compass. A plotting compass will indeed point to the Earth's Magnetic North Pole (not the axis pole), if not influenced by any other magnet; but its purpose is in plotting the magnetic field around a magnet.
A plotting compass is a small magnet which is suspended and is free to rotate. When it is near a magnet, the compass will always point in a particular direction (the north pole's direction) becasue of the force of the magnetic field.
A 10 degree angle cannot be constructed using only a compass and straight edge.
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By bisecting a 15 degree angle with a straight edge and a compass.
The two indentations in the pivot of a plotting compass allow for greater stability and precision when drawing circles. The indentations reduce friction and ensure that the compass point stays in place while drawing curves. This design feature helps to create smooth and accurate circles.
It is used for direction finding on a map when plotting a route.
COMPASS
put lines on the paper dummy
A compass and a straightedge
Compass