Helicoidal


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"The pipe running from the lower part of the balloon runs into this cylindrical receptacle through the lower plate; it penetrates the latter and then takes the form of a helicoidal or screw-shaped spiral, the rings of which, rising one over the other, occupy nearly the whole of the height of the tank.
"The spherical cap of the small cone is of platinum, so as not to melt by the action of the cylinder and blow-pipe, for the latter are placed upon the bottom of the iron tank in the midst of the helicoidal spiral, and the extremity of their flame will slightly touch the cap in question.
All of this unusual topological behavior points back toward the chiral nature of the crystal samples, which create a spiral or "helicoidal" electronic structure, as observed in the experiments, Hasan noted.
Another answers, "The helicoidal heart is a cemetery."
Avaliacao da Hiperplasia do Processo coronoide por meio da tomografia computadorizada helicoidal [Tese].
Results present the transformation of acoustic energy due to plane wave propagation as observed for a simple expansion chamber to a complex combination of plane wave and 3-dimensional wave propagation induced by the helicoidal geometry.