Dalton Board/Galton Board ,High School Physics Instrument Research Equipment

Description

Product Description
How to use:
Invert the instrument, pour all the balls into the V-shaped slot, insert the insert plate, and then turn over so that the V-shaped slot is on the upper part of the instrument, pull the insert plate and drop the balls, and the collision with the nail array will spread randomly, the distance between the nails is equal to the left and right, and each horizontal position of the upper layer is exactly in the middle of the two nails of the next layer, when the balls touch the nails during the falling process, Both fall to the left or right with a probability of 1/2, and then hit the next layer of nails, and so on, until it falls into the narrow slot of the bottom plate, so that many balls of the same size drop through the entrance, as long as the number of balls is quite large, it will pile up in the bottom plate into an approximate normal density function pattern (i.e. : high in the middle, low at the ends, low in the middle). An ancient bell type with left and right symmetry where N is the number of layers of nails.
Color: Yellow,Blue
package included:  1*Galton Board
Note:
This instrument consists of plexiglass, should be handled with care, do not collide, after use stored in a cool dry place.
Payment Policy
Shipping Policy
Returns Policy
1.
Paypal ONLY.
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3. Buyer need ship to other address (not Paypal confirmed address) should contact us before buy item.
1. Your order will be shipped within 1-2 business days once we receive your payment.
2. If you pay by e-check, we will ship your order once your payment is cleared.
3.We are not responsible for any customs duty incurred at foreign customs.
4.The shipping time is around
25-35 Business Days
depending on your location.
How to send a return request:
Attention: Please contact us via ebay message like the way shown above before starting a return request, so we can deal with your issue quickly and efficiently.
1.Return this item.
2. Select a reason: please choose"It's the wrong size or doesn't fit"
3. 30 days Warranty from the date of purchase covering manufacturing defects, but doesn't cover items that have seen abused, burned and damaged in any form.Please contact us if you have NOT received item beyond 5 working days, we will check it with post office and resend any missing item.