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Date: | Sat, 18 Apr 1998 00:34:41 +0200 |
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Hi Paul;
thanks for the segnalation; I have immediately taken 5 shells that I
believe(d) to be tigris, used the caliper and the rock & roll trial.
Number 1 (I thought that it was a tigris, but...): 1,566 and rolls over onto
it's base
number 2 ( I WAS sure it was a tigris): 1,428 and rolls over onto it's base
number 3 ( I WAS sure it was a tigris): 1,377 and rolls over onto it's base
number 4 ( I WAS sure it was a tigris): 1,466 and rolls over onto it's base
number 5 (juvenile tigris) : 1,438 and rocks but stays on its back
So, I have tryed to keep the shell not perfectly parallel to the surface,
and # 2, 3and 4 stood on their back, # 1 no.
Is this the trick, how do you keep the shell? I have deducted that if you
put only the very top of the back on the table, the shell have enough
kinetic energy to roll over the same: am I right?
Sandro
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