8 Mar
2013
8 Mar
'13
3:03 p.m.
On 03/08/2013 01:24 PM, Tony Duell wrote:
It was my original statement that referred to "spiral" when I meant helix.
On the other hand if you take the definition:
"A three-dimensional curve that turns around an axis at a varying
distance while moving parallel to the axis." with the variation of the
distance being infinitely small, you have a helix. In other words, a
helix is simply a degenerate case of a three-dimensional spiral.
But I did mean "helix".
--Chuck
Fred, you
stretched my head when you said helix vs. spiral. do you get
a helix on a flat plane with just lines on it? I thought helix would be
cylinder ruled with a line. maybe I'm taking what you meant out of
It is.
Helical slide rules, like the Otis King are cuylindrical with the scale
forming a helix around the cylcider (like a screw thread). In the cae of
the Otis King there are 2 cylders with scales that sldie one within the
other and also rotate relative to each other and a cydindrical cursor
that sldis and rotatesa over the outside with an indicaotr lien at eack end.