Before using a compass or compass, the following points need special attention:
1, you must first remove all ironware, electrical appliances (mobile phones, walkman ……) or items that will interfere with the magnetic field of the compass.
2. Note that there are no ironware, mobile phones, telephone poles, electric boxes, electric towers, etc. This will interfere with the electromagnetic field near the measurement location.
3. The disk surface of compass or compass (north) needle must be horizontal, and the pointer cannot rise or fall at the same time. At the same time, we should also pay attention to whether the joint between the compass surface and the disk body is tight, and there should be no looseness or damage.
4, check whether the compass or guide (north) needle is normal, if bent, it shall not be used.
Compass usage:
When measuring the direction of a fixed object:
Step 1: put the compass flat so that it is close to or parallel to the edge of the measured object.
Step 2: Slide the turntable to make the hairpin head of the magnetic needle match the two points on the red line of the compass base.
Step 3: Locate the reading direction of the layer pressed by the transparent line.
Compass orientation measurement: how to use a compass or guide (north) needle to measure the orientation of a house.
Before using a compass or compass, the following points need special attention:
1, you must first remove all ironware, electrical appliances (mobile phones, walkman ……) or items that will interfere with the magnetic field of the compass.
2. Note that there are no ironware, mobile phones, telephone poles, electric boxes, electric towers, etc. This will interfere with the electromagnetic field near the measurement location.
3. The disk surface of compass or compass (north) needle must be horizontal, and the pointer cannot rise or fall at the same time. At the same time, we should also pay attention to whether the joint between the compass surface and the disk body is tight, and there should be no looseness or damage.
4, check whether the compass or guide (north) needle is normal, if bent, it shall not be used.