How do you set a drawing compass?

make sure that the hinge at the top of the compass is tightened so that it does not slip. tighten the hold for the pencil so it also does not slip. align the pencil lead with the compass’s needle. press down the needle and turn the knob at the top of the compass to draw a circle (or arc)

How do you measure with a math compass?

Decide on the size of the circle. The compass is extended based on the circle’s radius. Use the ruler to measure exactly what the radius of the circle needs to be, then set the sharp point of the compass at that point on the ruler. Extend the pencil out to the ‘0’ measurement of the ruler to set the size.

What are the parts of a math compass?

Construction and parts

• Handle. The handle, a small knurled rod above the hinge, is usually about half an inch long.
• Legs. There are two types of leg in a pair of compasses: the straight or the steady leg and the adjustable one.
• Hinge.
• Needle point.
• Pencil lead.
• Adjusting nut.

How do you tighten a plastic compass?

The compasses don’t have a lock but there are screws on the head of the compass which you can tighten or loosen. The tighter the screws the harder the legs move.

What is a diagram of a compass?

Usually, a diagram called a compass rose shows the directions north, south, east, and west on the compass face as abbreviated initials. When the compass is used, the rose can be aligned with the corresponding geographic directions; for example, the “N” mark on the rose points northward.

How do you make a compass rose step by step?

How to Draw a Compass Rose

1. Draw Two 12′ Legs.
2. Draw Two More 6′ Legs.
3. Make Marks at 6″ up the 6′ Legs.
4. Draw the Sides of the Four N/S/E/W Legs to the Marked Points.
5. Draw Marks 6″ up the Point Edges from the First Marked Points.
6. Draw the Sides of the Short Points From the Tip to the New Marks.

What is math compass?

A compass is used in mathematics, drawing and drafting to create arcs, circles or other geometric figures that can be determined by measuring intersecting line segments. A compass can be used to bisect lines, find midpoints and help solve problems in geometry.

How do I keep my compass from slipping?

Make sure that the hinge at the top of the compass is tightened so that it does not slip. Make sure that the hinge at the top of the compass is tightened so that it does not slip. Tighten the hold for the pencil so it also does not slip. Tighten the hold for the pencil so it also does not slip.

How do you use a compass?

Position the compass approximately halfway between the chin and the belt, keeping the North arrow under the Luminous Bezel Indicator. 4. Proceed forward in the direction that your index finger is pointed. 9 2nd Method – With no declination diagram shown on the map.

How do you convert 360 degrees to 240 degrees on a compass?

Subtract 120 degrees from 360 degrees, leaving 240 degrees. Keeping the North arrow under the Index Line, rotate the Bezel until the Luminous Bezel Indicator is over 240 degrees. 4. Turn the compass until the North arrow lies directly under the Luminous Bezel Indicator.

How do you use the luminous bezel on a compass?

Example: you want to follow a course of 120 degrees. Subtract 120 degrees from 360 degrees, leaving 240 degrees. Keeping the North arrow under the Index Line, rotate the Bezel until the Luminous Bezel Indicator is over 240 degrees. 4. Turn the compass until the North arrow lies directly under the Luminous Bezel Indicator.

How do I use the orienting arrow on my compass?

The orienting arrow is located at the top of your baseplate compass; it indicates the way you have to follow. 4. Rotate the bezel of the compass until North and South on the compass line up with North and South on the map. Use the “orienting lines” (perpendicular lines on the background of the bezel) for more precision. 5.