1.scientific and educational instrumentsThe use

      Three-ball instrumentIt is an intuitive teaching instrument that vividly depicts the relative motion law between the day, the earth and the moon. It can simulate the relative position of the day, the earth and the moon in the universe, and can vividly show the operation state of the earth and the moon, and scientifically explain the resulting natural phenomena. Therefore, it is an indispensable auxiliary teaching tool to overcome abstract teaching, deepen students' mastery of the laws of celestial motion changes and popularize astronomy knowledge.

2.scientific and educational instrumentsThree ball instrument maintenance and precautions

1. When taking the instrument out of the packing box, please hold both ends of the base shaft with both hands to avoid damage due to too much stress on the handle.

2. When using, take the instrument out of the packing box, wipe it clean, and see if there is lubricating oil in each running part. If dry, should add a little.

3, in the demonstration, should start slowly, do not use impact force and high speed rotation. Otherwise, it will affect the life of the instrument and even damage it quickly.

4. During the demonstration, the push handle should be rotated clockwise to be correct, otherwise the transmission mechanism will be damaged.

5. When demonstrating solar eclipse and lunar eclipse, first check whether the battery in the solar sphere has electricity. In order to save time, the sun, earth and moon can be turned to a straight line first, and then the moon orbit can be lifted to the same height as the center of the sun and earth, and the solar eclipse or lunar eclipse can appear. After the demonstration, check whether the earth's axis points to the sun when the pointer points to the summer solstice. If it is not aligned, loosen the screws under the four-season plate and tighten them after alignment.

      6、Three-ball instrumentAfter use, still put back in the box, do not upside down, and store in a dry place.