We sometimes see the edge of the coin
A regular Nick
The serrated notch has a formal name
Called “edge tooth”
Why designers in the edge design of a sawtooth coin?
Is it to look good?
In order to hold in the hand is not easy to fall down?
In fact, not so simple.
Xiaobian immediately introduce
The design of this coin edge
The first is the famous scientist Newton design
In fact, the famous scientist Newton from 1686 until his death in 1727
Has served as director of the Royal Mint
When is this coin process
After the first metal cutting machine cutting rely on rotating horsepower
Then with the help of craftsmen’s eyes and hands
Make the round coins and printed on the pattern
This is called “chipped” silver coin
This is the most deadly defect of silver is easy to be abused
Think also ah
The silver surface marked with the currency in the middle
And all around and no special mark
So one would secretly cut a circle and then sell silver coins
In order to solve this problem
Newton invented the tooth edge design
That is on the edge of the coin is engraved cut rule
If someone is trying to cut part of the coin
The side tooth will destroy the coin
So people can easily see through
The side tooth coin is complete
To determine whether the coin had been tampered with
So we could understand
The largest coin edge function is actually a fake
The side tooth casting technology has been constantly in progress
For example, our last century minted in 90s
The five corners of the side teeth is intermittent side teeth
Now every year issued silver panda edge tooth is tooth bevel
The side tooth issued in recent years the Chinese Zodiac commemorative coins
The length of the interval is bevel tooth
Originally, a small coin unexpectedly there are so many mysteries!