Saturday 09 February 2008
(On the list sent by Stefano speleoit Bevilacqua)
Trying to
Replicate the experience of the Sardinian friends.
(L. Montanaro, 1992 - Comments on "circles" of the Cave
Sorell. Bull. Gr. Speleol. Sassarese, V. 13: 21-22)
We installed in the Cave Imbroglita necessary and bounded
Area.
Components of the group:
Stefano Bevilacqua and Silvia Uploaded (SCRoma)
Luke Cavallari (ASRomana86)
Nico Squicciarini (GSCAI Vespertilio-Bari)
Arriving in the early afternoon we again entered the cave. This time with the intention of completing it is hoped the experiment about why education circles.
Stephen has occupied part of the calculations and formulas, carpentry and installation with the help of Nico.
I cut wood listelle, photo-video and accessibility with tile
Silvia.
The cave I seemed slightly warmer and wet most of the previous time ...
Luke.
For the Video
it.youtube.com/watch?v=ZRi9bqhkpwsit.youtube.com/watch?v=Y7OxkqKwNDYThe circle into the cave : the numbers
Gianni Mecchia
I wanted first of all to congratulate Montanaro, Muccedda and C. For the good work and Stefano Cavallari Bevilacqua and Luke who have seen the circles that many others (including me) had not seen.
The circles are 10 recognized, the eleventh, the largest, is only mentioned and we are not sure is a circle. They are divided into two zones.
The first is the tilted floor of a hall collapse, over boulders has formed a tank downstream with a number of microvaschette.
Within this floor concrezionato are incorporated remains of stalactites and stalagmites.
The height of this part of the hall is about 5 m.
The circles (6) can be found on the floor tilted slightly above the area of micro trays. Only two have full perimeter, others seem undergoing a change, perhaps because they are on the transition speleological (the cave is not very popular, but it is catastata the years'40). APPEAR of concretion. The diameters of circles horizontal projection are about 40 cm.
The circles of this area were all measured.
The second area is on a descending casting a long slide in the same room. The circles (4) here are much more oval, because the floor has an angle of 50-60 °, and smaller. The height of this part of the hall is something about 2,5-3 m. The diameters of circles horizontal projection is less than 20 cm. The circles of this area have not been measured.
I give you the description of the most obvious, which is what was sent as an example and that is the first in the area.
This is an ellipse, but if we take its horizontal projection is a circle of 38 cm in diameter, with the height difference of 16 cm.
The stalagmite, which is still active, is 4 cm high and is hit by a drop that falls rarely (once every 5-10 minutes, we have not thought to take the time). When it falls to me that nothing seemed to fall in the circle.
The circle has a width of about 1 cm, and has filled the underlying microvaschette which were small, almost wave.
At the touch had not seemed thickness.
The falls drop by 5.15 m. On the ceiling there are few cm tall stalactites.
The circulation of air at that time was nothing.
The circle and stalagmite seem to have formed recently.
All 'inside the circle is a concretion fall and incorporated in the floor pans, and the circle is passed over without changing direction and without deformation or deviations. This in my view excludes the hypothesis A (Hill & Strong) because the concretion was intercepted at some points that reflected the drop, while the remains highly plausible hypothesis B (Hill & Strong) Montanaro, namely that the drop fragments falling.
The Rome Caving Club intends to repeat the experiment friends Sassari. It would be interesting to know some 'measures is that the cave Sorell than Toirano.
Sorry for my translation