Diamagnetism is the property of materials that are repelled by a magnetic field, due to the induced magnetic field in the opposite direction.
I do not have a N52 slider. But it rocks because it repels. If it is paramagnetic it will weakly attract e.g. Tungsten. The video clearly show it is not Ferro.
Wish I have access to an XRF metal analyzer to measure and breakdown the elements composition. I don't.
Thanks to your photo illustration. Need to buy a proper N52 to do. Good Night.
I dismantled an old spoiled Hard Disk Drive to remove the Neodymium magnet inside. Tested on this coin.
J0MivQeIIwk
I balanced the coin on my finger tip while avoiding direct contact. There isn't any knocking or touching of the magnet against the coin, if there is the coin would dropped from my finger pivot. Moving back and forth the magnet creates a changing magnetic flux to cause the rocking of the coin. Otherwise the coin is not attracted to the magnet.
Manage to get hold of a subscriber to ping test the coin with the correct 1920 FatMan Dollar Apps. I have no idea what alloy formula can emulate exact ping and pass Sigma for .900 Ag (Sigma doesn't have .89 Ag selection)? I will perform a specific gravity test when I have the necessary apparatus.
In between, the frequency spectrum looks much cleaner compared to when using the wrong Morgan Apps earlier in the thread.
Here are the closed up images, as best as I am able to take.
I apologise I followed up with lengthy thread and more photos as well. Here the Reverse:
Looks like gas occlude across the diameter? View from the other side
Otherwise the ping test is either Great or Good (I use Morgan which is free because I am not a subscriber). I am not sure a Silver Cast would give the same frequency as it is a function of density and more importantly Modulus of Elasticity.
Diameter 38.7mm, thickness measured at raised Rim is 2.4mm and thickness measured at background field is 2.2mm.
I can't find related materials, can someone help. I am keen to learn as I have a bunch of these type.
Numista shows there are proof coins for the 10cents
mine example: Obverse Reverse Closed up
I heard some of these proof went into circulation. But most are kept by the British during Colonial Singapore. Can someone with a known proof coin show photos to compare?
*** Moved by Staff moved to a more appropriate forum. ***
Only when I get back to the seller to purchase the coins, then I am able to do a specific gravity test. The heavier coin looks just slightly thicker when placing both coins side by side for a comparison. How much should I pay for for non-graded ones?
I can't find this in numista. Can someone help? Weight is 57.7g diameter 49mm, thickest thickness is 3.9mm, otherwise the fields is 3.0mm thick. What is the material of the medal?
Posted 02/22/2025 09:17 am
