0
Usenet Posted 22 years ago
Usage

"Polhode" and "Herpolhode"

Hi! Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object.
Many thanks!
earle
*
  

Top answer

[nq:1]Hi! Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object. Many thanks!

— Usenet

  • [nq:1]Hi!
  • Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object.
  • Many thanks!
  • earle *[/nq] Sorry for the delay in replying: Polhide : The non-plane curve traced on the surface of an ellipsoid with fixed centre by its point of contact with a fixed plane on which it rolls, as in the revolution of a top.
  • Herpolhode: A plane curve described by the point of contact of an ellipsoid with a fixed plane, the centre of the ellipsoid being fixed while the ellipsoid rolls upon the plane.
Free · every Monday

Get the Weekly English Kit 📬

New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.

4 Answers
0
[nq:1]Hi! Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object. Many thanks! earle *[/nq]
Sorry for the delay in replying:
Polhide : The non-plane curve traced on the surface of an ellipsoid with fixed centre by its point of contact with a fixed plane on which it rolls, as in
0
0
[nq:1]Hi! Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object.[/nq]
Aren't they Stanley Unwinisms?
Adrian
0
0
[nq:1]Hi! Would someone with access to OED give me a quick origin of these words: "Polhode" and "Herpolhode", which are words that describe certain motions in a gyroscopic object.[/nq]
The OED entries are in Greek letters, so SOED5 is actually better for posting, except that the OED credits Poinsot (1852) for 'polhode':

polhode, noun.
/"pQlh@Ud/
M19.
(from Greek polos pole
0
0
For a picture, see Herbert Goldstein, Classical Mechanics , 1st ed., Fig. 5-3, p. 161. A footnote on p. 162 avers: "the polhode rolls without slipping on the herpolhode in the invariable plane". Now you know.

Joe Fineman (Email Removed)
0

Related Questions