Tell me about the process of making things.

There are pine trees everywhere in our country, so it is not difficult.

There are many spreading scales on the mature pinecone, which are composed of wood fibers. Wood fiber will stretch when wet and shrink when dry. Using this feature, pine cones can be made into one.

Find a clean and complete pine cone and wood (or plexiglass, plastic board), glue and other materials. First, make the base as shown in the figure with wooden board or plastic board. Use wood file to smooth the pedicle of pine cone, and then use wood sandpaper to grind it. Use a thin plastic stick or

Make a pointer with a bamboo stick and stick an arrow cut with blow-molded paper or white cardboard at the end. Select a suitable scale at the lower part of the pine cone, stick the prepared pointer on the scale with Black & Decker, and then adjust the position of the pine cone on the bottom plate so that the swing of the pointer corresponds to the background plate. At this time, stick the pine cones firmly with Baxter. Calibrate the pointer position in sunny days, and calibrate the pointer position in rainy days. Draw the sun and the umbrella separately, and the pinecone rain gauge will be ready.

Put it in a ventilated place where the sun can't shine and the rain can't rain, and you can predict the weather changes in a few hours.

From this experiment, I learned that brave innovation is victory.