Written by the TreasureGuide for the exclusive use of treasurebeachesreport.blogspot.com.
Here is an interesting coin that is listed in the current Sedwick auction - a Cuba 1/2 reale that was struck over a U.S. half dime. There are other coins in the auction that were struck over coins of other countries. |
Cuban Half Reale Struck Over U.S. Half Dime.
Source: Sedwick Coins auction. See link below.
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Here is the lot description for this coin.
Cuba (Mayari), silver 1/2-real(?) token with incuse MORALES above 1 over 2 denomination, made from a US Seated Liberty half dime (1800s), very rare. 1.10 grams. One of very few examples known, all believed to be made from half dimes, this one to our knowledge the only one without a hole, with oversized arms (lions/castles) covering the entire reverse and the obverse punched with MORALES H(o) in a box above an incuse 1 over 2 believed to stand for 1/2 real. Clearly from the same series are some 10 centavos (supposedly) made on US dimes with incuse 10 and also a unique 20 centavos made on a Spanish colonial 2 reales (both of those denominations with JUNIO below the number), the last-mentioned with more of the reverse design showing a clear DE MAYARI below the arms. Toned Fine with no host-coin details showing.
https://auction.sedwickcoins.com/Cuba-Mayari-silver-1-2-real-token-with-incuse-MORALES-above-1-over-2-denomination-made-from-a_i33012333
This coin is lot 1020.
There are more strike-overs in the auction. This one already has a bid of over $2000.
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These days I often hear people say "You don't know what you don't know." There is some truth to that, but it isn't entirely true. I personally have an unending list of things that I know I don't know and would very much like to know.
Sometimes it is very important to know what you don't know. I wouldn't let a podiatrist do brain surgery on me, for example. Experts should be especially aware of their limits, and have a deep respect for the boundaries of their expertise.
I previously described how cuts are created. The one thing that absolutely has to happen is the water has to move with enough force to carry sand down the slope and out into the water. I've described how that happens when the water hits the beach at an angle and slices sand away.
Below I have a video that I previously posted that shows how cuts are created when the water is hitting the beach at an angle - in this case, it is an extreme angle. After that I have an excellent and very revealing video of an experiment conducted in a wave tank that shows how a cut can be created when the water is hitting the beach directly at a ninety degree angle.
Here is a video I caught that shows how a cut occurs when water hits the beach from an angle. In this case the water flows almost parallel to the beach. I showed this one once before.
The cut is moved farther back each time the water flows along the face of the cut. If the tide goes out and the water level drops but the water keeps hitting at a similar angle, another cut will be made lower on the beach. You three different cuts at different levels in the video. For a deep cut to be made the water has to keep moving along the cut for a period of time without the water level getting either much higher or lower.
That is one way a cut is created, however cuts can occur even when there is little or no angle to the water hitting the beach.
Here is a video that illustrates very clearly how a beach can erode when the water is hitting a beach straight on. Watch closely. This is great.
https://www.youtube.com/watch?v=y0C5sQ_NWs8
A wave tank is a different than a real beach in several ways, but the wave tank does help make some things clear.
If you carefully watch the beginning of the video, you can see a dip gradually form just below the highest reach of the water. Watch from second three through nine and you will see a dip beginning to form. The side of the dip highest on the beach continues to get steeper until finally it starts to collapse, and a small cliff (or cut) is formed. The cliff becomes higher and moves farther back on the beach as the water continues to erode into it. That is an excellent illustration that you couldn't see on a real beach in real time.
But that isn't all. After the first cut, a second cut forms a little lower on the beach. Why is there a space between the cuts, and why does the second cut form where it does?
What happens is that the sand from the first cut moves down the slope and that hump forms a steeper slope which focuses the force of the water and creates a new a new cut.
To sum it up, under specific circumstances such as those illustrated in this wave tank video, water hitting straight onto the beach CAN, under certain circumstances, cause a cut by first creating a dip that gradually increases until the slope is so steep that it begins to collapse, therefore creating a cut.
Steeper beaches return water at a speed and force that can carry sand down the slope (erosion). Waves with less force cause lower wider beaches that deposit sand on the beach instead of pulling it back into the water.
A real beach is different in a variety of ways. For one thing you don't have straight walls and the waves are more irregular in both shape and timing. The beach is not straight either. And the sand can vary in a number of ways, including grain size and compactness.
There is much more that you can see in that video if you keep watching, but that is enough to assimilate at one time. I'll probably comment on more of what you can see in that video at some other time. I do wish I could slow the video down.
Here is one tip if you want to study the video some more - watch the turbulent areas.
While on the subject I'll throw in one more video.
The tides are getting a little bigger. Today there will be a small negative tide.
The surf is only around two feet.
As I recall, Easter is on the first Sunday after the first full moon after the Spring equinox.
I think what I posted today will help you understand beaches better. There is more to come.
Happy hunting,
TreasureGuide@comcast.net
Sometimes it is very important to know what you don't know. I wouldn't let a podiatrist do brain surgery on me, for example. Experts should be especially aware of their limits, and have a deep respect for the boundaries of their expertise.
I previously described how cuts are created. The one thing that absolutely has to happen is the water has to move with enough force to carry sand down the slope and out into the water. I've described how that happens when the water hits the beach at an angle and slices sand away.
Below I have a video that I previously posted that shows how cuts are created when the water is hitting the beach at an angle - in this case, it is an extreme angle. After that I have an excellent and very revealing video of an experiment conducted in a wave tank that shows how a cut can be created when the water is hitting the beach directly at a ninety degree angle.
Here is a video I caught that shows how a cut occurs when water hits the beach from an angle. In this case the water flows almost parallel to the beach. I showed this one once before.
The cut is moved farther back each time the water flows along the face of the cut. If the tide goes out and the water level drops but the water keeps hitting at a similar angle, another cut will be made lower on the beach. You three different cuts at different levels in the video. For a deep cut to be made the water has to keep moving along the cut for a period of time without the water level getting either much higher or lower.
That is one way a cut is created, however cuts can occur even when there is little or no angle to the water hitting the beach.
Here is a video that illustrates very clearly how a beach can erode when the water is hitting a beach straight on. Watch closely. This is great.
https://www.youtube.com/watch?v=y0C5sQ_NWs8
A wave tank is a different than a real beach in several ways, but the wave tank does help make some things clear.
If you carefully watch the beginning of the video, you can see a dip gradually form just below the highest reach of the water. Watch from second three through nine and you will see a dip beginning to form. The side of the dip highest on the beach continues to get steeper until finally it starts to collapse, and a small cliff (or cut) is formed. The cliff becomes higher and moves farther back on the beach as the water continues to erode into it. That is an excellent illustration that you couldn't see on a real beach in real time.
But that isn't all. After the first cut, a second cut forms a little lower on the beach. Why is there a space between the cuts, and why does the second cut form where it does?
What happens is that the sand from the first cut moves down the slope and that hump forms a steeper slope which focuses the force of the water and creates a new a new cut.
To sum it up, under specific circumstances such as those illustrated in this wave tank video, water hitting straight onto the beach CAN, under certain circumstances, cause a cut by first creating a dip that gradually increases until the slope is so steep that it begins to collapse, therefore creating a cut.
Steeper beaches return water at a speed and force that can carry sand down the slope (erosion). Waves with less force cause lower wider beaches that deposit sand on the beach instead of pulling it back into the water.
A real beach is different in a variety of ways. For one thing you don't have straight walls and the waves are more irregular in both shape and timing. The beach is not straight either. And the sand can vary in a number of ways, including grain size and compactness.
There is much more that you can see in that video if you keep watching, but that is enough to assimilate at one time. I'll probably comment on more of what you can see in that video at some other time. I do wish I could slow the video down.
Here is one tip if you want to study the video some more - watch the turbulent areas.
While on the subject I'll throw in one more video.
I didn't even get into what is special about cuts or why they are good for metal detecting. I'll do that in the future.
---
The tides are getting a little bigger. Today there will be a small negative tide.
The surf is only around two feet.
As I recall, Easter is on the first Sunday after the first full moon after the Spring equinox.
I think what I posted today will help you understand beaches better. There is more to come.
Happy hunting,
TreasureGuide@comcast.net
