Beam compass

A beam compass is a special tool that helps us draw circles or arcs of different sizes. It has two main parts: a long, straight stick called the beam and a pointy metal tip called the needle. The needle can move up and down along the length of the beam, and can also be adjusted to make it longer or shorter.

To use a beam compass, we first choose the size of circle or arc we want to draw. Then, we adjust the needle so that it's at the right distance from the center point of our circle or arc. We can do this by sliding it along the beam and tightening a screw to hold it in place.

Next, we place the needle at the center point of our circle or arc, and hold the other end of the beam firmly with our other hand. Then, we rotate the beam in a circle or arc around the center point, and the needle will leave a mark on the paper as it goes. We can keep doing this until we have a complete circle or arc drawn.

A beam compass is useful for lots of different things, like drawing precise circles for math or science diagrams, or creating fancy designs in art. By adjusting the needle and the length of the beam, we can make circles or arcs of all different sizes and shapes.