Hunting for artifacts: choose a metal detector
Well, dear reader, you are inspired by all the materials read and seriously decided to purchase a metal detector (hereinafter referred to as MD) Or, as it is called in the Kopar medium, an "appliance". Just an appliance. The very thing with which we will look for various artifacts. We do not write "to search for treasures," since this is still not the most frequent find.
The most common find, the most desired find, to which the overwhelming majority of metal detectors are "imprisoned" is, after all, a coin. That is, it is a flat kruglyash made of non-ferrous metal, most often copper or an alloy based on it - bronze or brass. Less often silver, sometimes aluminum, sometimes of low-grade silver - a billon, quite rare from gold. It happens that it is completely made of iron.
Some general information
Therefore, any metal detector, designed to search for historical artifacts, most cheerfully and fervently reacts to a circle of non-ferrous metal.
For example, the aluminum cork, which in our fields is lying in tens, and sometimes hundreds of times more than coins. This is the so-called "alko-thaler", as the coppers joke. Our people, alas, for the most part do not adhere to sober views on life.
The plugs from the drunk "charlie" often find themselves in compost piles, along with the rest of the garbage, which then falls out onto the fields.
The signal from the aluminum plug is practically indistinguishable from the coin signal, it has not been taught by any, even the most advanced metal detector, to discriminate it (to distinguish it from the other "flower" and ignore it). Therefore, here is the first knowledge of the subject - if you vparivayut device and argue that he discriminates aluminum and distinguishes aluminum plugs from the coin, do not believe it. Absolutely breach, there are no such devices yet (for November 2014).
What does a novice usually look for when buying a device? Of course, to the depth of the search! "Does it take you to catch it?" - this is the first question that a "hunter for treasures" will ask. The second question: "Is it worth it?".
The depth of detection is always written in the accompanying documents. And, as a rule, they write the depth of detection of a coin. But it should be remembered that coins are different - there is a 30-gram thaler, with a huge shielding surface, and sometimes there is a weightless miniature borat or, in general, a scrawn the size of a full-length on the little finger.
Therefore, let us with the "average" coin declare the Soviet five-kopeck and from him and we will dance.
Instruments can be different. The most unpretentious ones will find in a moist soil a flattened five-pentat at a depth of 25 cm, and those instruments that are more serious will notice (insecurely, but notice) coins at a depth of 60 cm. But the greater the depth, the less precise the discrimination of the device. That is, what lies there, deep underground - a gold coin or a rusty nail MD you will not say.
The search conditions are very different and the conductivity of the ground is very variable, and even the same coin can lie flat, or maybe on the edge. She can lie alone, and can be among the iron garbage.
A potential cop is warned that most coins and other finds lie at a depth to the bayonet of the shovel. The device that takes deeper many is simply not needed.
And let's imagine that we have an instrument with a super-maximum depth of search and, as a result, rotten discrimination? And if he will periodically give you some "fuzzy" signal at a depth of 60 cm, estimate how many physical forces you will have to dig how many holes, how many nails, bolts or pieces of aluminum wire will your emotional powers suffice for? Believe me, not much.
Let's figure it out. With an average number of finds in the place of average "badness" we will find about 3 coins per hour. Each coin will have about a dozen "left" finds - corks, sleeves, shrapnel, wire. It already turns out 30 per hour. Although what there is "30 per hour" ... More, much more! If you consider that the shortest search day can hardly fit into 3 hours, it is easy to calculate how many holes you have to dig and how many times to bend down and sit down. This is me to the fact that the newcomer does not need to chase the ultimate depths. The bayonet of your shovel - that's the maximum depth of search and that's enough for now.
Although there are devices that are specifically designed to search for large metal objects at maximum depths - the so-called "deep-waterers". But this is completely different, a separate story.
A little more detail about discrimination
Another important criterion that should be considered when choosing MD is the discrimination mentioned above. That is, the ability of the device to distinguish black metal from color. Discrimination can consist, depending on the chosen search mode, that the device simply ignores the "blackberry" and "hawala" exclusively "the color stone", or that it signals about the finds from different metal with different sound or different tone of the sonic signal.
But even here it's not so simple. As it was said above, the device is imprisoned on a coin, so about large pieces of pork, for example, if you have a plow under the spool, he joyfully "screams" with a clean colored signal.
Also "raspberry" rustle and heavily rusty objects from iron. However, information about the find can be obtained not only by means of a sound signal, but also visually - on the display, if it is provided at your device.
As for my personal preferences, I'm closer to finding one's ears with a multi-tone instrument. Multitone, this is when every metal object in the search area has its own special "voice" and cacophony in the headphones, a person who has learned to understand his device can very clearly imagine the whole picture of what is underground right before him. Wire, sleeve, shrapnel I hear very clearly, but the cork from the coin, alas, I do not distinguish, so I have to dig any color signal.
Another important criterion is the tightness of the device. And pay attention, if it is a question of tightness, you should always find out the tightness of what is meant - brains, coils, or both.
The search is not always carried out under the sun on a dry field.
Personally, I question the integrity of the brain (do not laugh, get used to slang) decided very simply - with the help of a plastic bag, which I pull on them with the first drops of rain. The package is then screwed with electrical tape.
Price and Manufacturer
The following criteria for choosing a device are the price and the manufacturer.
I saw how Chinese-made instruments work, whose names differ only by a couple of letters from the best examples of the American and French electronics industry.
They work, as a rule, not bad and not for long. Before my eyes, at such an instrument, the coil was first stratified. The owner dried it, filled it with silicone and glued it with epoxy.
Then, about a week later, the brains fell off the bar, they had to be repaired in the field with the help of improvised means. Well, then, after a couple of trips to the field, the bar itself broke up exactly in the middle. Part of it was later replaced by the elbow of a telescopic rod. However, the device is still working, so I'm looking forward to hearing from him new Hochma.
The most important criterion of choice is ergonomics. If the length of the rod is easily adjusted for your height, then with the weight of the device, alas, nothing to do. Weight is different and even 100 grams play a big role.
Choose the most convenient for you, there are only two.
The first conditionally we will name "peeing boy" the second - same as we hold a hacksaw when we saw. Are the images clear? If not, look at the photo.
And at the end of my narrative, I want to warn you that in all post-Soviet countries there have been unclean comrades who are trying to "push" the military mine detectors IMP-1 and IMP-2 to beginners. In the Kopar community, they are called "sticks" for the similarity of form. They are absolutely not suitable for our occupation. Moreover, they are said about them that with their help one can find only the cover from the sewer hatch and then if you know exactly where it lies. Exaggerate, I think, but this device is designed to search for mines - heavy metal objects.
That's all about the instruments, if it's short. You need to choose the device that you like. But do not rush to draw conclusions about the potential of your new friend immediately after the first departure to the field. Learn a little understanding.
Personally, after I first went out into the field with a device that I have not parted with for the third year already, I was very disappointed in it and even had the desire to shuffle it against the tree trunk so that it would not torment me and would not torment me. Full mutual understanding came about after the tenth departure. Now we do not spill water. What do you want.