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IV Statistical complements
To correlate the three parts requires a place of joint prospection. Only the fields can be taken into account. The apparatus more used in the fields at the time of the statements was To card-index it 1265-X. We will not take account of Tésoro Silver Sabre More.
Let us recall that one hectare is prospected in 4 h. 07 min.
One hectare contains:
11,5 |
parts |
8,7 |
interesting objects |
9,1 |
copper waste |
5,0 |
lead waste |
2,1 |
iron waste |
11,5 |
cartridges of hunting |
5,4 |
aluminum capsules |
24,7 |
unnamable waste |
On 78 objects detected out of one hectare, 57,8 do not have any interest and only 20,2 will be kept, among which 11,5 represent parts.
The time of extraction of a kept object being of 1 min., and 29 dryness for a waste, we can now determine the exact duration to traverse one hectare.
48 minutes are necessary to release the objects.
One hectare is thus probed in 4 h. 07 min. + 48 min. is 4 h. 55 min.
One can find:
- a part all 21 min.
- an object interesting all the 29 min.
- a waste coppers all the 27 min of them.
- a lead waste all 50 min.
- an iron waste every 2 hours
- a cartridge of hunting all 21 min.
- an aluminum capsule all 46 min.
- an unnamable waste all 10 min.
One digs a hole every 3 minutes !
- 1500 m3 of ground are prospected per hectare, which accounts for 1 part for 130 m3 is 140 tons!
One hectare contains:
- 2,9 Black poplar of France
- 2,2 Double Tournaments
- 0,6 Sum of money Tournaments
- 1 5-10c Napoleon III
- 1,4 parts of the 20th S.
- 0,4 Gallo-Roman part
- 0,4 part in balk
- 0,2 silver coin
There is a part:
- out of money every 4,34 hectares.
- in balk every 2,41 hectares.
- Gallo-Roman every 2,29 hectares.
One can find:
- 1 Black poplar of France the every 1 h. 11 min.
- 1 Double Tournaments every 2 h. 10 min.
- 1 part of 20th S. every 3 h. 27 min.
- 1 5-10c Napoleon III every 4 h. 48 min.
- 1 Sum of money Tournaments every 7 h. 46 min.
- 1 Gallo-Roman part every 11 h. 15 min.
- 1 part in balk every 11 h. 52 min.
- 1 silver coin every 21 h. 23 min.
All the values delivered in this part can be regarded as very representative. To find the 1983 parts in the fields (cf left 1) it took about 845 hours of prospection is projectivement 35 not-stop days for a total surface of 1,7 km² (1 km out of 1,7 km).
Conclusion:
The results provided in this analysis (in particular in part II) are valid in a ground prospected for the first time.
However, although a zone can be probed perfectly, one can note at the time of later search which it is always possible to detect of the objects.
That can be explained various manners:
- If the ground is plowed by a plough the ground is stirred up up to 30 cm of depth. A detector which can probe only the first 15 centimetres (cf left III), the deeper parts will have to await the work of the ploughings to go up.
- More surface of the object is large more it will be felt deeply. A part positioned vertically in the ground will be able to pass unperceived whereas the same one placed horizontally is localised. Least harrowing will be enough to make available a part which was not before although being it always with the same depth.
- the wave propagation of the detector fluctuates according to climatic conditions'. A dry ground and a wet ground react differently.
- the stones go up supposedly in the course of time (in the very long term). One can think that the parts are subject to the same influence. That remains to be confirmed.
- We saw in part III that a correctly traversed piece comprises nevertheless " dead zones " due to a variable percentage of loss. Accessible parts can thus be forgotten.
It will be thus possible to make the happy discovered ones on a ground already prospected of many times.
After several years of experiment one can evaluate the total quantity of objects contained in a field. Compared to the lucky finds carried out at the time of a first passage (carried out perfectly on all the surface of fields), one can estimate that the traversed zone conceals in fact 5 times more objects.
One hectare should contain 11,5 X 5 = 57,5 parts in all, but that remains well on only indicative.
A concept which was not approached yet for the moment but which is however of primary importance relates to the quality of the lucky finds. Indeed, the objects are preserved more or less well according to the acidity of the ground. An acid ground corrodes metals whereas a basic ground covers them with an oxide gangue. The extreme case is that of a basic ground become acid by the intensive use of manures. The fields are thus unfavorable to parts of good quality (especially for those consisted of copper).
One can notice that the sandy fields, more quickly dry than the others, offer a quality of definitely higher conservation.
The wood of fir trees and oaks have a ground more acid than other wood; this zone is thus to avoid, more especially as the humus is significant there.
Also let us announce that the parts are of very variable wear. In general they circulated a long time before being lost. A part of which all the reliefs are well Nets is rare.
Only 1/10 of the parts can have an interest. Moreover, the most current currencies to find are the least quite with dimensions.
Thus do not hope to make fortune by reselling your lucky finds, keep in you the joy of the discovery. Most significant it has not been to make revive objects lost for several centuries, which, without you, would die in the lapse of memory '...
V.VENET
N.LECLERC
A remark is essential: If one can say that our two colleagues detect quickly (too much), they them also lost many targets since detected only that half of surface in reality... Only the " cheeses " giving the percentages of the currencies discovered are right. Since 1993 (date of these statistics) the number of currencies with doubled, that of the gold coins did not change. It would thus be necessary to traverse 120 hectares to hope to find of them one (according to the preceding study) and perhaps even not far from the double in reality.
Here what we can add in the light of a recent test on March 22, 1998.
On 31 prospectors having taken part in the following test, the results are very variable: thus we had asked the users to
traverse 100 m and to count the numbers of sweepings which they made. During this time, we measured the time and the
width of sweepings.
Total average:
Some individual data on a course of 100 m
Certain apparatuses can beings considered as inoffensive, certain people too!
