A PROSPECTION WITHOUT CLOUD!!

It is a quite curious title. And yet, the clouds are numerous in prospection. There is a few years a friend said to me that there were also the " tales and legends " of the prospection....

The cloud about which we will speak today is not of different than the famous oxide halation about which you surely heard speak in some always objective reviews not... This halation about oxide, is theoretically released by a currency or an object for a long time hidden in the ground, which enables you to detect the known as-object more deeply than if you had buried it yourself!
All would occur very well if we did not have had the idea to make a test. Moreover, load with those which claim that it really goes (what we doubt) to prove it scientifically to us. We will say simply that this Halation resembles a little a certain animal extremely known resident of with dimensions of the Ness Log! For proof, you believe which a " halation " as fragile as it is can resist a ploughing without being literally dispersed ' '

The Test: To make a success of it suitably, you need: a rule in figure graduated, a wood small plank of 5cm X 20 cm, two currencies (Napoleon 10 centimes for example) identical, one which you bought in a secondhand trade or with the chips (thus not patinated) and the other that you found in prospection of the kind to the quite farinaceous patina, do not forget a shovel and a detector.

Regulate your apparatus as you usually do it and put an equivalent level of discrimination to cancel a large nail. Check that at the selected place there is not an other metal object while putting to you in any metal and withdraw what you could find. Dig a hole of approximately 20 cm in your garden, then deposit the small plank with horizontal at the bottoms of the hole the new currency to the one of the end, and with the other pose the rule, stop the hole and check if you detect something... There two solutions arise:

- You do not detect anything: put the currency less deep.

- You hear a sound: put the currency deeper by adding ground.

In all the cases, note the depth to which the sound delivered by your apparatus starts to be either inaudible, or hatched (you would not dig for such a target)

It is strongly advised to add the ground centimetre per centimetre. The ground should not form a bump with the top of the target, it must be deposited uniformly and on a square of approximately 30 X 30 cm, without what your apparatus is likely to take the currency on the with dimensions one of the bump (what distorts the result). Then made in the same way with the patinated currency...

Arrived at this stage, in general, one with surprised his life of prospector: the patinated currency is detected less deeply than that which is not it!! It is thus the patina and the action of its various components which caused this result. Imagine the same situation in a mineral-bearing ground and you will include/understand the following history better: one day a friend takes me along in a wood where it had found some currencies grouped on a surface of approximately 5 square meters (zone which it had prospected particularly well). That made a few times that it had not returned has this place and we had all the two same apparatuses (1266 X). After a few hours of prospection a sound ended up arriving at the helmet of my colleague, and it says to me: " It is another, it is sure " (it detects with a level of discri of 1.5 and 2.5 in discri 2).


I look with the miens with 3.5, the hatching sound, I says to him that it is a nail but which for him, it is a beautiful discovery and that he has to only dig (it is always beautiful a nail). Joke with share, and by mutual agreement, we decide to delicately dig with a knife in order to know exactly with what a depth is the object, at the end of 10 minutes we discover a copper coin with fourteen centimetres!! The roof! For such a currency, the importer ensures you that the apparatus take it to 37 cm! So that the target is detected correctly, it was necessary to however put 2 of discri., once come out of the ground, one could detect it up to 6 in the air. We did not even say a word on detection in a mineral-bearing ground. There, the performances are all bonnement catastrophic enters 14 and 23 cm for top-of-the-range!

Only when one digs, one with always the impression which the hole dug is deeper; initially because the eye badly calculates in three dimensions, and that of " judged " one thinks well that it there of at least thirty centimetres (whereas there is only twenty of them). Then, one can some times move the object detected by burying it more deeply as one digs. When one ends up leaving the target the hole, this one made thirty five or forty centimetres (always with judged), which makes think of some that the object was well with this depth. For this reason a rule must always be planted in the ground when one makes the test explained higher.

Ah! To finish, you think that the tests in the newspapers are really made on targets with a halation ' Diantre not! Some say that if... In this case it would be better that the currencies go back to at least Jules César, the " halation " will be only larger, and since time, he must make at least 5 cm in diameter well!!! But whereas of work to carry out such a test!
We also requested from a large professor chemistry specialist in metals, which it thought of all that. It was surprised to learn that a currency released a " halation " for somebody who is a specialist in metals and their oxidation! And here what he says: " Patina and Oxidation that is not the same thing. Only the copper or copper coins overlap with patina ", this one replaces little by little the metal (exactly as the nail which rusts) with the result that gradually metal is replaced by the patina. Thus in a few hundred years our good old men sesterces will be only wafers of patina. Besides it will be thus then impossible to find them like many of other things... A Silver or Gold currency does not create a halation; That out of Money very right a light black patina. Damage they are rarest... The history of the halation was invented by some not very scrupulous salesmen for two reasons: the first, to make you believe that by burying parts yourself and in the absence of halation, it is normal that you do not find the same depths as those indicated in the tables of tests. The second, to place you in situation of inferiority while making you understand that you are a little a ignare of detection.

If the patinated currency is detected less deep, it is because it is oxidized in-depth (in metal and also on the surface: the patina which one sees). This changes the conductivity of metal (speed of conduction of the current) and thus the analysis made by the detector. Then, certain apparatuses use which use the eddy currents, when they detect currencies patinated are lost and tend to deliver a " rotted " signal when the currency is deep.

Then now, load with those which think the opposite of bringing to us the scientific proof of the " oxide halation "!

So long