It appears also from (II) that the null-lines whose distance from the central axis is r are tangent lines to a system of helices of slope tan 1(r/k); and it is to be noticed that these helices are left-handed if the given wrench is righthanded, and vice versa. [Please select]
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Three New Helices from California, by S. [Please select]
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If the ends of a shaft are turned in opposite directions, or one end is turned and the other is fixed, all of the fibres except those at the axis tend to assume the form of helices. [Please select]
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The species usually selected by the Eumenes is one of the smaller Helices--Helix strigata--frequent on our parched slopes. [Please select]
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