Monday, September 29, 2014

9/29/14 Report - Things That Can Affect Your Metal Detector ID Readings. Depth Readings. Rare Gold Coins.

Written by the TreasureGuide for the exclusive use of

Three Dollar Gold Coin
Source: See link below.
I did a little test using the Ace 250 today.  I wanted to see if the depth meter is very accurate.  I used a new dime and quarter and Tungsten ring for the test. 

The depth meter on the Ace is in two inch increments, starting at 2 inches and going to 8.

I placed the items on the ground stuck a yardstick in the ground beside them and moved the coil over the individual objects at various heights.

With these surface objects, the depth meter worked somewhat but was not real accurate.  I can only characterize it as somewhat accurate - not highly accurate.   

This test was a very crude test, so I won't try to draw a lot of conclusions from it.  My general conclusion is that the metal detector's depth readings for items when tested in this manner does give some idea of depth, but may not be real precise.

I don't know if naturally buried items would result in depth readings that are more or less accurate.  There are limits to how precisely you can measure the depth of buried objects when you dig them anyhow.

When you are leisurely detecting, take time to carefully notice the precise signal and readings and try to remember them and relate them to the actual object when it is dug.  That will help you learn to better understand your detector.

In my estimate, this inexpensive little detector works very well considering the low price.  There are times when I would use it instead of detectors that cost ten times more.  It isn't the deepest seeking detector in the world, isn't always totally accurate, and has other limitations.  It is enjoyable and useful though.  I've previously described my multi-detector approach to some sites.

One side note is that the Tungsten ring was identified as a pull tab on the ID scale.  

The Sinker.
Just after conducting the above test, I spent a few minutes detecting in a yard that had been detected probably twenty times before with different detectors.  In those few minutes I found a couple of interesting things.  First dug was a zinc penny that had obviously been missed before.  It was right beside a lead sinker (see picture), which might be why it was passed over.  The sinker jumped back and forth between penny and dime on the ID meter.  Actual coins read more consistently. 

Also found in those few minutes in the seemingly over-hunted yard was the following Alabama tag which reads 2.5 Alabama.  The tag is 1.25 by 1.5 inches.

It produced a less consistent ID reading than a coin.  When flat on the surface, it was identified as a quarter and half, jumping back and forth.  It also occasionally gave an iron reading.

After digging it up I did a little test to see if I could find out what caused the mixed ID.  When the object was flat on the ground, it read as a coin (jumping between quarter and half), but when I stuck it in the ground so it stood on end and detected over the edge, the ID was iron.

The Alabama Tag.
My most general conclusion is that the position of an object in the ground can affect the ID reading.  Second, an object buried at an angle will give a variable signal as the coil goes over it at different angles and positions.  Sometimes the coil will be more parallel to a slanted object and at other times moving so as to detect more of the edge.  That will result in different types of signals and different IDs.

I decided to try to replicate the experiment with a quarter.  Of course I got a good consistent ID when the quarter was flat.  When I placed it on edge, I got a good reading most of the time, but also, but also now occasionally got the iron ID.  The iron reading with the coin on edge was rare though, unlike with the tag.  The iron reading obtained by detecting the edge of the tag was pretty consistent.

I'm assuming that the more accurate and more consistent ID on the standing quarter was due at least in part to its additional thickness. 

I'm guessing the tag is tin, but don't know that for sure.

I continue to learn more about my detectors and how they respond to various objects. 

Anyone know what that tag is?  Please let me know.  I don't think dog tag, but maybe.

In a nice series of articles on rare coins that can be bought for under $5000.  This one (part 6) is on hree dollar gold coins.

Close Up View Of William M's Found Locket.
A day or two ago I mentioned GoPro.  They make the action cameras that are often used on TV detector and diving shows.  The stock went up another ten dollars, hitting 90 at one point today.

I posted some items found by William M. the other day.  One was a runner medallion.  Bruce B. sent me the following information about that.

 Just a note, I have a cross-country medal my grandfather won in 1910 or 1915 very similar to the medallion here. My grandfather eventually became a Big Ten cross-country champion, but the medal I have at home is for a much smaller venue—a competition in Evansville, Indiana. The piece in your photograph hence would seem to be typical of the period.

Thanks Bruce.  I'm sure William  will really appreciate that info.

Here is a correction concerning the locket I posted yesterday.  William M. sent me a close-up of the locket I showed yesterday.  He says the picture in it is a print rather than a photo.  Notice the dots. 

Today on the Treasure Coast we have a 2 - 3 foot surf.

The surf will be 1 - 2 feet for the next few days.

There is no tropical activity that will affect us.

There is one day remaining to give your response to the blog poll.

Happy hunting,