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It is a very classic engine model
Weight：520g
sucker rod pump
and its cover can be opened to allow learners to see the structure inside more clearly
The interior is a frame structure
NIKOLATOY® Galton board normal distribution model Size:Big It is a very classicDescription INTRODUCTION TO GALTON BOARD Place a small round glass ball with a diameter slightly smaller than the distance between two nails at the entrance. As the ball descends, it rolls down to the left or right with a probability of 1 2 after hitting the nails, and then touches the next layer of nails. Continue like this until you roll into a grid on the bottom plate. Continuously dropping numerous small balls of the same size from the entrance,
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