# nœud[French]

A unit of speed used by ships and aircraft, = 1 mille marin per hour. The mille marin being 1852 meters, a noeud is a speed of 0.5144 meters per second. Symbol, nd, or kn (from the English “knot”).

Formerly a ship's speed was measured by counting equally-spaced knots on a rope pulled out from the stern of the ship. For how knots were actually measured on shipboard in 1795, see this description.

## source

Chacun des nœuds du loch parcouru dans les 30 secondes du sablier ou dans la 1/120 partie d'une heure correspond à une marche d'un mille marin par heure. Ainsi 9 nœuds filés en 30 secondes indiquent une marche de 9 milles ou de 3 lieues marines par heure.

Each knot of the log-line run out in the 30 seconds of the sand-glass, or in 120th part of an hour, corresponds to the speed of one mille marin per hour. Thus, 9 knots run out in 30 seconds indicate a speed of 9 milles marines or 3 lieues marines per hour.

Édouard Hospitalier.
Formulaire Pratique de l'Electricien.
Paris: G. Masson, 1883.
Page 32.